i am doing essentially the same except with a 23" display without changing anything.
I will say, something odd.. you know the mac screen of death, where it goes shaded and tells you have to reboot.. I've had that several times since i started using css + crossover. I'd reccomend closing steam and crossover anytime you're not using it.
and even more oddly. People have complained (including myself) about random crashes.. I have no idea what this means but it seems like I can play at night when servers are less crowded and the thing wont crash ever. Even more oddly when it does crash (aka just dissappear) its always when im in game and shooting a handgun. go figure.
-tadd