Ya, it's best to get out there and just try a couple. You'll know pretty quickly if the geometry is okay. Remember to, if it's a close fit/call, you can change stem length/rise, handlebar sweep/width/rise and move saddle backwards/forwards in small increments (be careful with this b/c you don't want a bad pedaling position). However, maybe start to look for something with a bit more slack geometry...like a 68* or 69* head tube angle for starters. Some companies like Cannondale have adjustable angles (using three shock positions to change head angle). I find 68-69* a good compromise between xc and all mountain freeride. However, as you probably know too, other factors like fork travel with affect geometry.
-I know a few people on kona's. Coil-air/dawg great place to start
-rocky mountain slayer: either standard or sxc
-giant trance