70 year old's final build

I have a lot of respect for the users of this forum. Am asking for comments on my planned build. I will use it for gaming and some overclocking. Any and all comments will be appreciated. Chances are this might be my final build and I want it to be kinda OK. My specific questions a should I use 4GB RAM?: should I go step farther and do SLI?; or should I wait for the Nov. NVidea cards? Here is the build: thanks for your input!!

Lian Li PC A71 case
PC Power 750 Silencer
Asus Crosshair
Athlon 64 X2 6400
Asus 8800 GTX 768 MB vid cd
Crucial 2gb DDR2 800 PC2-6400
2 Seagate Baracuda 7200.10 500GB SATA HD
Samsung 18X DVD +rw-rw
Logitech mouse(mXRev) and Keyboard(G15)
Vista Home premium 64bit
Mitsumi floppy
Dell Ultrasharp 24" monitor
Arctic cooling freezer cpu fan
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Lian li PC A70 case
Asus Striker Extreme
Q6600
4GB Crucial Ram BalistixDDR2 8500
Asus 8800 GTX Sli
2x WD Caviar Caviar 750MB (SATA)
750w Silencer
Thermalright 120 Ultra
BenQ FP241W Monitor
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