I am about 5'6 or 5'7 with a like 30 inseam. I currently ride a trek madone full dura-ace and I don't want to screw it up racing. The Madone is a 52cm and I don't know if I should be looking at a 52 or 54 cannondale frame. I am set on an older like 06-08 CAAD frame. which size would be better?