OK, a bit late for me to join the thread since you've built it all, but I've been busy... Anyway for future reference, here goes:
My advice: keep it simple. A lot of agonising is going on here about number of pumps, ID of tubing, sequence to mount things in, yada, yada...
First of all: a single PC Power & Cooling PSU 500W will comfortably feed all your stuff. Even your OCZ 520 will probably manage.
Second, there is not much benefit to choosing 1/2"ID tubing over 3/8" ID tubing, especially if all your components have 3/8" ID barbs. But whatever you do, go for the thick walled (1/8" aka 3mm) stuff to prevent kinking.
Mount blocks in the sequence that produces the shortest, least complicated loop. As long as you put the res last, you're OK. Some people prefer to put the rad firstafter the pump, and there is some logic to that.
A BIX2 will comfortably cool your whole setup. You can even get away with quiet low-flow fans. Push
and pull fans will give you little gain over pull alone.
A single MCP600 pump will comfortably supply your system. Don't obsess about flow.
Post pics. Lots of pics.
