Lightweight, warm, comfortable enough - Therm-a-Rest RidgeRest SOLite Sleep Pad Irregular

For the price, you can't beat the weight and warmth of the RidgeRest SOLite. It is the best value in sleeping pads. Some people prefer the accordion style folding of the z-lite, but I prefer to roll my pad and strap it to my pack. If you need more cushioning, it might be kind of hard on your back, etc., and a neoair x-lite might be what you are looking for. However, if you are just looking for something basic to help keep you warm at night and take the edge off sleeping on the ground, this is the ticket.