just got my soma rush from the UPS man. the thing is amazing. my only concern is that it may be slightly too small. i checked the geometry on the soma website (http://www.somafab.com/geometry03.html) and it seems as though the difference between the 51 (mine) and the 53 is minimal. is it worth the cost/time to exchange? is the difference between the two minor or is it really going to make a huge difference? if it matters the bike is not built, i just threw some wheels on there for reference.

thanks