Guys: What type of body on a woman is most attractive? (pics included)?

Three women, sizes 8, 12 and 14: http://www.theage.com.au/ffximage/2008/04/05/majthreegirls_wideweb__470x393,0.jpg Which do you guys prefer, and why? I look a little bigger than the woman in the middle, but I always have the feeling that I have to look like the size 8 woman in order to look pretty. I think its... show more Three women, sizes 8, 12 and 14:
http://www.theage.com.au/ffximage/2008/04/05/majthreegirls_wideweb__470x393,0.jpg

Which do you guys prefer, and why? I look a little bigger than the woman in the middle, but I always have the feeling that I have to look like the size 8 woman in order to look pretty. I think its disgusting how a little bit of my belly is bulging out, yet a lot of men think its sexy. Is having a slim body figure no longer attractive?
Update: I know the size 8 girl looks like she's small to be an 8, but these three ladies are tall models so thats why the sizes seem out of proportion.
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