New boxes I'm Putting Together

Since my old rig burnt out I decided to make a pair of rigs to run my Shamans on. 2 Shamans per PC. Here's what I'm lookin at so far. I'll be ordering all of the parts on the 19th or 20th after I get my taxes and my bonus check in from work.

Case: Lian Li 7B
Motherboard: EVGA 113-M2-E113 AM2+/AM2 NVIDIA GeForce 8200 HDMI ATX
Processor: AMD Phenom 9600 Agena 2.3GHz Socket AM2+ 95W Quad-Core
Video Card: EVGA GeForce 9600 GT Superclocked Edition 512MB
RAM: G.SKILL 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400)
Hard Drive: OCZ Solid Series 2.5" 30GB SATA II Solid State Disk (SSD)

Not sure on PSU yet, I'm thinking either Thermaltake Toughpower like I have in my main rig or a Power and Cooling, 500w or so should be fine I think. Then there's the question of the operating system. As cheap as RAM is these days I'd rather dump 8g in but I'm just not sure about buying Vista when there's already a new windows in the works, any thoughts?

then dont spend on the os use windows 7 until it expires then buy it.

dont know if it matters but the MS website says beta no longer available. may be a work around though but i dont know it.