I want to like this build alot its got decent heat management and when you get warmed up with your PPCs you can fire away with your UAC's I have done quite well in it in the few games I have played just wish I could fit in an XL because its a tad on the slow side for sure.
You could replace one of the UAC/5's with an AC/5. Would allow you to fit a 325 XL and still have 1 ton free for whatever.