I really really really want a nice butt...
Screw abs (of course, if someone is handing them out I'd get in line.) It's all about the booty for me. My rear is rather large and I have an 'exaggerated lumbar curve'... Basically, where my lower back meets my butt it's like a ski slope. I want to tone and tighten and lift that sucker UP! I've been squatting like crazy but lunges seem to hurt my knees (go figure) hopefully with more strength and better form I'll be able to do those too.
What body part are you working towards?