Need assistance finding the right power supply

[Ketchup]

I am building a new system next week, and would appreciate any help finding the best-wattage power supply. When I used web site like Asus, Newegg, and Thermaltake, their answers were all over the board. Here are the parts I am looking at buying:

ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner
Western Digital Caviar Black 1TB Hard Drive
GIGABYTE GV-N660OC-2GD GeForce GTX 660
Logitech MK550 Black USB RF Wireless Ergonomic Wave Combo
GIGABYTE GA-Z77X-UD3H Motherboard
Intel Core i5-2500K Processor Intel HD Graphics 3000 (will be overclocked)
4 GB of DDR3
4 Case Fans (likely)

Here is the power supply I have been looking at:
Rosewill CAPSTONE Series CAPSTONE-550-M 550W ATX12V v2.31 & EPS12V v2.92 SLI Ready CrossFire Ready 80 PLUS GOLD Certified Modular Active PFC Power Supp

I am also considering an SSD drive, but that shouldn't make too much of a difference in power draw.

Thanks so much for any help here.

 

[Blain]

SeaSonic S12II 620 or the M12II 620 if you can't live without a modular PS.

 

[Ketchup]

Thanks Blain, quick response. For a little more I can get a Rosewill 650 that is 80 Plus Gold. I would like to try one of those higher level golds and see how they do. It's a tough one though as the Seasonic is a bronze and a little cheaper.

 

[TemjinGold]

You can do the 450w capstone.

 

[lehtv]

You can do the 450w capstone.

Capstone 450W $60
Capstone 550M $75

I'd pay the extra $15 for future-proofing and modularity.