As a roadie looking for a nice USED full suspension Mountain bike, I find it very over whelming with so many bikes available over the years. I had a Cannondale V-500 full suspension bike back in 1999 and while it was fantastic on the fast downhills it seemed very un efficient on the flats and uphills. It bobbed like a drunkin sailer with every pedal stroke. So I hear that nowadays those are issues of the past. I hear we have FS bikes that almost as efficient as hardtails when pedaling but still have some rear suspension to knock the edge off the bumps. My question is this. What year range should I be looking at? When did the manufacturers figure it all out? Maybe some suggestions on what to look at in a XC friendly FS bike that could be had on the used market for say....under $700.00.