I recently bought a 2013 Camber Comp, Never had a 29er or a FS before so I knew it would feel wierd to start with. My LBS only had a Stumpy in so I sat on that to get the size right and then ordered the Camber
Put a few miles on it, swapped out the stem and bars and its perfect.
Its easy to get wrapped up in Geo numbers and stuff, but the bike you test ride is ultimatley very different to how it ends up feeling after a few personal tweaks anyway.
Dont over think it.