I was worried the 20 degree bag might be too warm, though I could bring something to line it with and use that instead getting into the bag (I like to have *something* draped over me). I'm one person in a two-person tent - and that's right, I'm not at all concerned about space (it's also got a truck carrying stuff - but I"m really looking forward to being able to toss everything on the xtracycle instead of humping it all to the tent sites, and being able to shop if the mood strikes me). I HATE being cold, though!
I've done hardly any tent camping - our family always went to the nifty little cabins in the woods. I might even be a REAL weenie and bring the aero bed...