I just bought a KHS XC 604 bike and am very happy with it. The only thing I would like to change in the future is the rear shock. It came with a Manitou Radium R air shock which isn't bad, however coming from a hardtail and riding the bike around the streets also from time to time I would like a lock out option. I went to the LBS the other day and was sitting on a bike with the Fox float, and I like the adjustments of them. However locating good priced rear shocks isn't as easy as finding forks. Can you guys give me some ideas for an upgrade, with a relatively low cost, and maybe thoughts on how much I could sell my current shock on ebay for? Here is a link to the bike and its set up, the front fork is pretty good with adjustablity, I would like the rear shock to have more adjustability then the current one. ALso if you guys could post some links to the shocks and where I can buy them?