Required Power Supply for new system?

[Shaitan00]

I am in the middle of building a new system (looking to build a monster/killer system). I've pretty much decided what components I want to get, the only problem is I have no clue which Power Supply is needed/recommend. I am not looking to be cheap (money isn't a huge issue) but still wish to stay resonable.

My new system profile is the following:
[Profile]
CPU: INTEL Core 2 Quad Q9450
MOTHERBOARD: Asus X48 DDR3 (still debating on which one)
VIDEO: ASUS/SAPHIRE 4870 (Arctic AccelS1 rev2 with dual fans)
RAM: 2x2G OCZ DDR3 PC-12800 1600 MHZ (Platinum or Reaper HPC)
HDD: 4x Western Digital SATA2 500GB
2x Western Digital PATA 320GB
Case: Full ATX Tower with 5x 120mm & 1x 200mm fans

Question is...
a) how powerfull of a Power Supply do I need? 650W? 700W? etc...
b) what are the prefered manufactuers & models?

Any advice would be greatly appreciated.
Thanks,

 

[mpilchfamily]

Look at the 550W to 750W PSus from Corsair. They will be your best overall options.

 

[gramboh]

Corsair TX650 (non-modular) or 620HX (modular) would be my recommendations depending on whether you care about having modular cables or not.

 

[Quiksilver]

Well you surely don't need anything more than 600W total, but you may find a deal on on another PSU with more wattage than that.

Anyway I believe the most preferred brands would be:

Corsair
Xigmatek
Enermax (possibly, is still TBD; [IIRC liberty units kept dying randomly like a year later, gotta wait to see if the new lines suffer the same fate])
Seasonic
Silverstone(some)
Coolermaster (some)
Antec
Etasis
FSP (some)
PC Power & Cooling/OCZ

Anyway that should be enough to have you looking, I'm sure others will add more brands.