New Complete Build Intel Quad Nvidia -Help Please

Hey Guys,

I just spent a godawfull amount of time speccing this build. I'm bleary eyed and can't see straight. Can the Guru's out there give me some advice please. Any help would be appreciated. It is supposed to be a mid range gaming rig with room for future expansion (SLI increased HD capacity etc). This will be my 2nd build, 1st one that I will attempt overclocking with. For about $1500 (mostly new egg and including some extra $$$ for the non specified items at the bottom)) I have put together:

Antec Twelve Hundred Black ATX Full Tower Computer Case - Retail
Item #: N82E16811129043

EVGA 132-YW-E178-A1 LGA 775 NVIDIA nForce 780i SLI FTW ATX Intel Motherboard - Retail
Item #: N82E16813188027

Western Digital VelociRaptor WD1500HLFS 150GB 10000 RPM SATA 3.0Gb/s Hard Drive (bare drive) - OEM
Item #: N82E16822136296

EVGA 896-P3-1260-AR GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
Item #: N82E16814130370

Antec NeoPower 650 Blue 650W ATX12V / EPS12V SLI Certified CrossFire Ready Modular Active PFC Power Supply - Retail
Item #: N82E16817371010

Intel Core 2 Quad Q9550 Yorkfield 2.83GHz LGA 775 95W Quad-Core Processor Model BX80569Q9550 - Retail

2GB DDR2 PC8500 DUAL MEMORY / Kingston KHX8500D2K2/2GR / HyperX Memory Kit TIMES2 for 4GB

Windows Vista (what version and where should I buy it?)

(Some cheap kind of DVD drive.)

CPU cooler recommendations would be great, that will fit on a EVGA 780i FTW motherboard

Did I forget anything?

THANKS!