I'm looking at getting a Poprad and it jumps from a 49 to a 52 in sizes. the 49 comes with a 52.5cm TT and the 52 comes with a 54.2cm TT. My current road bike has a TT of 54cm and a 100mm stem. Would I want to go for the 49 so I have some room to play around with so I can just throw a larger stem (110) on for commuting and a 100mm stem on for cyclocross racing? Or do I want to try to get into the 52 and throw like a 90mm on for racing?