Hello I'm trying to buy my first mountain bike. Shopping used right now trying to get a quality bike for $600 or so. I found a 2012 trek 6000 for $600. Also found a like new diamondback recoil full suspension bike for $350. From what I researched it has weaker components but with a upgrade can be decent. Any opinions on either of these bikes would be great. Also could you let me know any other brands that I should be on the look out for? Thanks.