It's funny though...I don't recall the OP even mentioning racing. Just XC riding. I think I'm the idiot that brought up racing. I'm so competitive and argumentative.
I'd buy the Cobia...that's a great price on a unique ride. It would work well for your intended purpose. You may save a little energy with a lighter 26" wheeled bike, but you'd be cooler ballin on a 29'er.