I LOVE my new 2010 Hifi 29er!! I also ride a GF 29er HT and I was little skeptical on how well a FS would climb but I thought even if it didn’t climb great it would still climb good and I would ride it for races or events were FS would be a + and there isn't too much climbing. I was dead wrong...this bike climbs extremely efficiently both in and out of the saddle. I find myself wanting to pull out my Hifi for every ride I do but sometimes fight the urge and give my HT a turn. I know some have brought up flex in FS frames but the 2010 Hifi has been totally redesigned and is based off the Superfly 100 which has gotten great reviews. GF told me that the Hifi is simply an aluminum Superfly 100 with identical geometry, pivots and lengths. There are a number of great FS 29er out there but for your price range and an XC discipline I don’t think you can go wrong with a Hifi.