That silverstone will likely be just fine. although it's rated at 400W, is had sufficient current on the 12V rail (according to the Silverstone website, the max load on the 12V is equal to the max load on the PSU, which is a little odd). Thus, I assume the current on the 12V rails is limited to 400W minus whatever the other rails require.... It should be somewhere around 27A-29A, which is enough for your rig, even when overclocking it.
Soloz2: too expensive!! I start to get as tired of people saying NUUO when they hear PSU as other people get tired of hearing Core 2 Duo when they here CPU Upgrade.... It all depends on budget, and the NUUO does not cut it budget wise (not to mention all the other issues I have with it)