I agree with the general consensus:
1. Seasonic makes excellent power supplies
2. The Super Tornado is marginally quieter than the Super Silencer
I am running the Super Tornado 400W, and can't hear it. I would highly recommend them. Also, unless you are running an SLI setup, the 350W supply will be fine. Since powersupplies are typically more efficient at higher usage, you don't want to buy way more than you need anyway.
So, I would definitely get the Super Tornado, and if you want the 400W just get it somewhere other than newegg.
-D'oh!