430W Thermaltake enough?

I'm currently powering this system.

Core 2 Duo e6600 @ 3.25Ghz
2GB XMS2 RAM
P5B Deluxe Mobo
eVGA 7900GT @ 625MHz Core 1600MHz RAM
X-Fi Xtreme Music
1 WD Raptor
2 Samsung Spinpoint 250's
NEC DVD-RW
Zalman cnps 9500
Zalman VGA Cooler
3 120mm Case Fans

I'm trying to add on 2 more hard drives, I feel that 430W is sufficient, but worst case scenario what can happen with an underpowered PSU in a system like mine?
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More about 430w thermaltake enough
  1. I'm using a Thermaltake TR2 W0070 ATX 430W Power Supply 115/230.

    http://www.newegg.com/Product/Product.asp?Item=N82E16817153023

    I built everything into one of those calculators and it seems that 357W peak is what I'm looking at. I'd assume this Thermaltake is reliable enough due to the good reviews.
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