Power supply

Hi

I've decided to build my first computer to replace my ailing dual core. I'm working on as much future proofing as I can afford, and have started working loosely on the spec of a Cyberpower Black Pearl. No real idea if this is a good idea but it has some very good reviews.

Spec chosen so far.

HAF-X full tower with USB compatibility
Asus P6X58D-E Intel X58 socket 1366, pci-e 2.0 (x16) - ddr3 2000 3 way sli motherboard
Intel i7-950 (can't afford 980) 3.06Ghz 8mb cache socket 1366
6gb (3x2gb) Corsair xms3 ddr3 pc3-12000 1600Mhz unbuffered
Western Digital Caviar 1tb 7200 HDD
Windows 7 home premium

The above is sorted, just hope I've not made a balls up, (comments appreciated non the less). I am using existing Nvidia graphics card but looking to upgrade to Nvidia GeForce 580 around Christmas for which my existing 500w pus will not suffice. So...

I have my eye on a Corsair HX(UK) 1000w ATX EPS12v modular psu.

Is this my best choice taking into consideration I do not want to buy another psu when I add/replace any components?

P.s. Using existing optical drives also but will want to upgrade to bluray at some point and run 4 internal HDD and 2 externals. (I have a huge amount of personal and business date to store and backup)

Comments and help will be appreciated.

a 1000watt power supply will only be useful if you intend to sli and overclock a 700 - 750 watt power supply will be plenty enough if you only ant 2 run a single graphics card. i dont see why anyone not using multi moniters would need 2 580's.

Try a PSU calculator to see if what is the system's demands in power. I would add up at least 100 watts to the calc's result just to be sure that I will have enough power for any future upgrades. Also buy a PSU from a decent company. Corsair is the best choice but also expensive. If money is not a concern then go for the corsair.