i'm another one who has dated girls ranging from itty bitty to rather large-boned, let's call it. i've never dated anyone taller than me, i seem to like em small and mean, but i'm pretty ambivalent about girth from my own point of view unless it gets in the unhealthy range, and it has, and i've managed to herald discussions without treading on feelings, pretty much.
i learned to deal with not being terribly hot a long time ago. however, i've never really been obese, although i've trod on the heavy side. i find my weight tends to stay even so long as i eat consistently; if i eat too much crap for a long period of time, there is a weight i stay at, and if i take care of my food and get some exercise, i find myself at a significantly smaller weight without much notice in between. i have also noticed i tend to be heaviest when i'm not happy. but, what i am attracted to is pretty much the person, although i do want the person i look at the most to be on the healthy side of whatever weight they carry best.
regarding the aesthetics of bewbies; big is not always best; a good handful is probably ideal. however, the two women i have been attracted to the most in my life both have/had pretty sizable racks.