User Review: Therm-a-Rest Men's Trail Lite
Price Paid: $65
I've had mine for about five years, never a problem -- except that it has been about four years since it self-inflated, which is why I didn't give it 5 stars. Still, blowing it up takes only about a minute.
My ultimate backpacking solution is a 2/3 length closed cell foam pad plus my Thermarest on top. Toasty warm, great comfort, and minimal weight, for the cost (okay, I'm still salivating over the NeoRest, but can't see spending the dough when I've got a good solution already).
BTW, if you're looking for the ultimate car-camping solution, nothing beats the REI 3.5 Camp Bed. Way too heavy and big for backpacking, but more comfy than a decent futon bed.