I'm into ultra-compact and use an original/early NeoAir 3/4 - I think it's 8 or 9oz and smaller than a 16oz beer can. I find it really comfy at 2.5" thick and R3, good to ~freezing (I use a quilt/wear long UW). I also have the the Kylmit Inertia Xlite and Xframe, which can get you down to soda can size, but didn't find it as comfortable or warm, and a valve popped off.

I'm 5'8" and prefer 3/4 lengths - I like using my pannier (or backpack) with spare clothes as the last 1/4 pad for my feet. They only need ground insulation and that frees up tent storage space for my bag/clothes.

My Neo is a bit crinkly, but it doesn't bother me at all. There are quite a few aftermarket pad pumps (I also have a down Exped that uses its stuff sack as a pump) but I'm not worried about breath moisture/mold if there's no fluffy insulation inside it.