I agree with Aimless about pads. You've already picked a great bag in the Ultralite. (However, if chest girth is an issue - it was for me - look at the Alpinlite: 5 additional inches in circumference for 2 or 3 additional ounces; same temperature rating.)

If you are looking for a little more comfort, I like my 48" NeoAir; I put my empty pack under my lower legs (which simultaneously solves the problem of where to store it in a narrow solo tent.) I'm going to get the All-Season Neoair and try it this winter - I'll know how it works by the time you're ready to get a pad.