Well I've started to get into single track trail riding. For the past few years I've gone at Mohican state park here in Ohio and really enjoyed it. This past weekend I was there and decided to rent a real bike (Gary Fisher Marlin hardtail) to see how it was. I am honestly hooked now. I am in the market now for a decent used bike to replace my POS 12 year old Giant. My budget is $500. I found this one locally: 2007 Gary Fisher Marlin and am going to look at it immediately after this post. Anyone here have any experience in the sport? I really liked the feel of the Fisher I rented, and I think this one might fit the bill. Any suggestions?