For some gear I'm willing to pack a few extra ounces for a good cause, and sleeping pads definitely fit in that category. A good night's sleep makes a big difference in attitude and performance, and this baby will have you counting sheep in no time.
You can get it insulated or not, in regular, long, and petite lengths, in both normal and wide and as a mummy or rectangular shape.
My theory is that for cold regions maximum floor coverage is the way to go. So even though I'm 5'10" I use the long version, and I would have used the wide had it been available when I made my purchase. I put this on top of a jigsaw mat that's cut to my tent's floorplan.