hey guys...i am deciding on wether to go with a 165 mm or a 170 mm. I have a 32-33 in inseam. I want to build a a fast bike. I'm going with a 46/15 for freewheel and 46/17 for normal day use. I have small hills to get around on campus. there not that bad...i just want to build a fast bike. I search, read a couple of articles. But i'm still somewhat confused by reading both sides of the arguement. What do you guys think