12:56 p.m. on May 3, 2006 (EDT)
Just a couple comments -
As Tom said, I would stick with the Kelty for a few years more. My wife and I still use our Kelty externals a fair amount (a 1950s era Backpacker and Mountaineer, a Tioga, and a Sherpa), although we also have Dana Terraplanes for our expedition packs, plus a couple of GoLite packs, a Kelty Cloud (an internal, very light weight), and an Osprey Aether 60 for weekend to week-long backbacking. The Osprey has proven amazingly good for weekend climbing trips, although it is intended for weekend backpacking with a max of 40 pound load (rope, harness, and a rack of cams, nuts, and carabiners add up to 20-30 pounds by themselves). Plus a bunch of daypacks. Again, externals have the huge advantage of good ventilation, which really makes a difference on hot muggy days in the MidWest, East, or Southeast US. You can also carry heavier and awkwardly shaped loads a lot more comfortably, and it is easier to strap stuff on the outside if needed. The advantage of internals, aside from current fashion, is that they fit closer to the back and are narrower, hence better for climbing and scrambling off-trail, and they are warmer for those winter trips.
I would guess your Kelty is a Tioga. The Tioga and earlier models are a lot lighter for the capacity than the internals (Mountaineer and Backpacker were about 2 pounds, Tioga about 4, with the effective capacity of a 5000-6000 cu in internal, vs 5-8 pounds for an internal of that capacity).
Your other gear is also just fine for starters. You will eventually want to upgrade most of it, but don't start accumulating "the latest, greatest" gear until you have a few hundred miles under your belt (and on your back and feet) and more than 50 nights, including a few 4 or 5 day trips. Keep a log of all the gear you are taking, how much it weighs, and whether you really used it, plus a list of "ought to have had along" gear. An awful lot of gear looks great at first, but proves a waste of money and extra useless weight (plus occupying too much storage space at home). Like the combination "eating tool" (don't know what else to call it) I was given a few months back - combined spoon, fork, knife that, like virtually every combination "thing" does nothing well and everything poorly. Just get a lexan spoon from the grocery store picnic section and use your simple pocket knife (don't waste your money on the hunnert pound 50 tool swiss army knives of "multi-tools" - they cost too much, do nothing well, and weigh far too much).
One of the first upgrades is likely to be that Slumberjack sleeping bag. They are ok, but your +40 bag could be a better made, lower weight (1 pound for a +40 bag), longer lived bag (longer-lived meaning less costly in the long run). Coleman bags are also ok, but there are far better bags that are a lot lighter in weight for a given temperature range (Marmot, Integral Designs, Big Agnes, North Face among the synthetics, Feathered Friends, Integral Designs, Western Mountaineering are the top down bags). You can get a 15 deg synthetic bag at 3 pounds or less, and even my -40 bag (down) at 4 pounds.
The ThermaRest pads are as good as you can get for an inflatable light pad. When you start really cold weather camping you will want something thicker, or perhaps just add a closed cell pad under the Thermarest. Down and Primaloft - filled inflatables are quite a bit warmer as well.
Eureka tents are pretty good for the money, so you won't need an upgrade of that for a few years, probably until you start full 3-season camping (early spring and late fall, when it is a lot colder). Yeah, with Rover along, you want a 3-person tent.
You will soon find the Snowpeak stoves to be inadequate and expensive to run for anything more than a weekend overnight. Snowpeak's canisters are by far the most expensive per ounce of fuel, and their stoves are pretty low heat output, as you would expect for such a small light burner. Also, in cooler weather, you will find that butane has serious problems, namely losing pressure. Butane (the primary constituent in canister fuels) has a vaporization temperature at freezing. Since the fuel cools as the vapor evaporates, the problem starts showing up at air temperatures around 40F. There are ways around this (many discussions on this forum). One thing is to use the larger canisters from MSR, Primus, Markill, and others (they all use the industry-standard threaded connector, so you can use up to the 500 gram size with no problem). These still lose pressure as the fuel is burned off. But you may find you want to go to a liquid fuel stove. The MSR Simmerlite is a white gas stove that is easy to light and light weight, and will have no cold-weather problems (I have used one on backcountry ski trips and on Denali).
Your base pack weight is ok, though I would consider it a bit on the heavy side. The food, water, and extra clothing will add a lot to that, though (count on 2 pounds of food per person per day, and 2 ounces of fuel per person per day). You can keep the water weight down with your filter, though you may have to make a lot of stops to filter - study the terrain you are hiking through beforehand to figure out where the water stops will be. Be sure to keep well-hydrated (half-liter per hour is reasonable when hiking in MidWest weather, or maybe even more). General rule of thumb for pack weight is 15 percent of body weight for beginning backpackers, 25 percent for moderately experienced backpackers, 30 percent for hardcore supermacho types (except climbers - somehow for backcountry climbing we get up to more than 50 percent, over half of which is in the climbing gear, and more than body weight for expeditions). When you decide to go light-packing, you will get down to the 10-15 pound level for a weekend, including food, fuel, extra clothing, etc. But don't try that until you have several years of experience.