My $0.02 (coming from an American) 1) Don't buy used unless you are a mechanic and know exactly what you are looking at. By the time you price in wear parts (chain, pads, chain ring, suspension refresh etc) and the lack of warranty you likely are going to be upside down. Look at Nukeproof, the new Specialized Status, Marin (not sure if you can get them), Transition etc. 2) If you are asking this question, go for the bigger bike. There are a lot of reasons I say that but the biggest one is you can always ride a big...