hmm... well u have nice computer specs...
here let me suggest a few...
for video i would go with : Jabo's Direct3D6
audio: Zilmar's Basic Audio, Jabo's DirectSound, Azimer's Audio
input: NRage's Direct-Input8 1.6
u can get the plugins here :
http://www.smiff.clara.net/utils/plugins/index.htm
hope this helps...
its good for testing and trying... each games good with each...
so hope this helps!
have a good day!
if u need any help feel free to reply! and i will try my best to help u!