Lets compare video cards first.
memory bandwidth 13.44
Fill Rate (pixels/sec) 1.6 billion
Vertices per Second (million) 300
Pixels per Clock (peak) 4
RAMDACs 400 MHz
And a Geforce 7900
GeForce 7900 GTX GeForce 7900 GT GeForce 7900 GS
Graphics Bus Technology PCI Express PCI Express PCI Express
Memory 512MB 256MB 256MB
Memory Interface 256-bit 256-bit 256-bit
Memory Bandwidth (GB/sec) 51.2 42.2 42.2
Fill Rate (Billion pixels/sec) 15.6 10.8 9
Vertices/Second 1.4 Billion 940 Million 822.5 Million
Pixels per clock (peak) 24 24 20
RAMDACs (MHz) 400 400 400
and the 7600
GeForce 7600 GT
Graphics Bus Technology PCI Express®
Memory Interface 128-bit
Memory Bandwidth (GB/sec) 22.4
Fill Rate (Billion pixels/sec) 6.7
Vertices/Second (Millions) 700
Pixels per clock (peak) 12
RAMDACs (MHz) 400
As you can see by the bandwidth, fill rate, vertices, and pixels per clock the card you want to use is quite crippled.You can but a 7600 for $100 and a 7900 for $160 and the money will be well spent of the better graphics.
As for power supplies i do not like the ultr4a series. Better to spend the n0oney for a Antec, or Enermax that are quieter and produce more reliable power. I would also go with a PS that had 2 12 volt lines instead of one so one line can be dedicated to the graphics card.
As you can see prices are not much different. I like the enermax simply because they are quieter. A pure silent high powered computer is what i am always looking for. It looks like any PS wopuld fit in that case. Nowadays, power supplys are almost generic( with a few exceptions) and most all fit every tower case computers. All plugs are also generic as there are only about 6 types of plugs. Mainboard 24 pin, molex 4pin, Sate 15 pin, floppy 4 pin, cpu 4 pin, and video card 6 pin.