Firstly, go for the Audigy 4, it has got to be better, and reviews seem to like the speakers I have on my desk, and in my sig more than those creatives, unless you are 190% on 7.1, like I was, but the reviews persuaded me after a while!
Also, the RAM in my setup (similar setup to yours) is much faster, while costing a bunch more however.
Also, for all that stuff, I would say jump up to a more powerfull PSU, like the one in my sig, which was modeled for the SLI systems.
Also, Asus seems to have gone WAY down in quality in the last few months, plus it is not as configurable, and OC-able as the LANParty (again, see sig).
Last thing! I am not sure what the response time is on that monitor, but since this is a strictly gaming rig, you really want to be careful, the response time really MUST be 16ms or below for games!
100% best of luck!
XS RULES!!! I have officially referred you.