I find that I like guys that are within my height range...
within 3 inches (shorter or taller) is perfect, because we always seem to fit together. I have a friend that's my height (5'4") and her boyfriend is 6'3". They always look so uncomfortable when they "cuddle" because he's so much taller than her. (Here comes a stupid analogy) They seem like 2 puzzle pieces, her from an advanced 1000 piece and him from a toddler's 8 piece. I don't know if that'll make any sense to you guys but... it makes sense in my mind.
so in short, I think people of equal or close to equal heights work (or just for me)
