1) You have a Non-K i5 so Overclocking (and the extra power are not an issue.
2) Your system WHEN loaded should be under 300 Watts, And just slightly over 100 Watts when at idle.
REF:
http://www.anandtech.com/show/6276/nvidia-geforce-gtx-660-review-gk106-rounds-out-the-kepler-family/16
3) GPU manuf suggested Min PSU is incase the user has a "not so good" (LOL) PSU, and there are plenty of them out there.
Bottom Line, Yes a QUALITY 430->450 Watt PSU will handle your system.
Two excellent choices(Better from a quality standpoint than many of the Mid level 500 W.)
1st choice:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817256063
2nd Choice:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151074
The recommendations for a 500, does allow for more headroom and possibly upgrading to a higher wattage single card later, For Xfire with two GPUs, I'd probably go with a 650 Watt.
In any case, never buy lower than Tier 3, Personally I shoot for a tier 2 (tier 1 are great choices, but normally fair jump in price).
Corsair is a great brand , and I do highly recommend their TX and HX line-up, But ther CX (Value) is really only a tier 3 PSU (GS - Listed as tier 2, Probably a good choice, but better ones available).
Tier list:
http://www.eggxpert.com/forums/thread/323050.aspx
Added @ John Bong
"no...the gpu requires a 500W minimum...and thats with no OCing and not more than 2 case fans "
OK made me check, My System i5-2500K OCed to 4.2GHz, GPU = 7850, 16 Gigs of ram, 2 SSDs + 2 HDDs + Blu-ray Burner and O'Yes 4 Case fans.
Total wattage as measured at the wall for Computer while running Furmark (1920 x 1080) (which loads GPU more than a game).
TOTAL wattage was UNDER 250 Watts!!!!!! NOTE using 80% eff this means that the Power provided by the PSU was really LESS than 200 Watts
Measurement made with P4400 Kill-A-Watt meter.
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