I have a pretty wide-ranging appreciation of the female form, and have of course seen some very beautiful "waifish" girls, but overall I tend to favor somewhat heavier/curvier women. My threshold for what is "too fat" is far further along the scale than a lot of guys. There is a point where obesity becomes gross to me, but a certain amount of "overweightness" looks great to me. A lot of women carry the extra weight in great places, and that body type appeals to me a great deal.
I like a fit/athletic body too, but only if it looks strong. Bony, skinny girls aren't usually attractive to me, and a lot of times they just look weak and frail. Plus there is no butt! I am kind of neither here nor there on big boobs, but a nice-sized, nicely rounded butt is very appealing to me.
A recently-framed silkscreened poster that I finally got up on my wall after hanging onto it for 7 years in a shipping tube kinda says it all:
