I play Red Orchestra, too. Been playing since it came out in October 2003 for UT2k3. In fact, I think I heard about it first on this forum (been lurking here a lot longer than I've been registered).
Anyway, the retail release, Ostfront, is incredible, and it's only getting better. A new patch is scheduled to come out this month, with even more updates scheduled well into 2007. It's the only game besides AH that's been able to keep my interest for more than a few months.
Hawk, RO has diving, too, and a really cool feature where you can rest your rifle on just about anything to steady your aim. All in all it's definitely worth a try, and at less than $30 I doubt you'll find a better bargain.