Recommended changes to new rig

[Sayn]

I'm building a new Gaming PC and hoped you guys could check over the possible setup, maybe list some improvements.

Intel Core 2 Quad Pro Q6600
Gigabyte GA_P35_DS3R Motherboard
Crucial Ballistix 2GB (2x1GB) DDR2 PC2-8500C5 1066MHz Dual Channel Kit
BFG GeForce 8800 GTX OC2 768MB GDDR3 HDTV/Dual DVI
Tuniq Tower 120-LFB CPU Cooler
Western Digital Caviar SE16 500GB SATA-II 16MB Cache
Microsoft Windows Vista Ultimate 32-Bit Edition OEM
Corsair HX 620W ATX2.2 Modular SLI Compliant PSU
Arctic Silver 5 Thermal Compound (3.5g)
Antec P182 Super Midi Tower Case (Gun Metal Black)

Would 2 sets of the GeIL 2GB (2x1GB) PC2-6400C4 800MHz Ultra Low Latency RAM be better than the current RAM?

Thanks for any input.

 

[Sayn]

I will probably be using it on a HDTV so would the 8800GTX be wasted at 1366 x 768 res?

 

[Sayn]

Roughly around the £1000 point. Ideally less though, obviously.

 

[Sayn]

possibly a sound card, have everything else already.

 

[Sayn]

4x1 GB RAM, vista x64 are the only thing that stand out to be improved...

So would 2GB RAM and a 32bit Vista be better? does anyone have a recommendations for a type of RAM to use? Amount of RAM? and finally would 800MHz or 1066MHz RAM perform better with the Q6600?