Hey guys would this pump: http://www.frozencpu.com/..._Coil.html?id=x5L4TWpk
 
Be able to push through two 360 rads and a cpu and gpu block, potentially adding another gpu block to that loop later?

I cannot comment on that pump, but I would recommend a MCP655 from experience. I have one pushing through a RX360, EX360, EX120, CPU block, and a block for my 590 without struggle.

My old loop used that pump and it pushed through two radiators (480,240) and four blocks (CPU, 2 GPUs, motherboard). The temps weren't bad or good.  They were okay. Get a better quality pump like a D5 or DDC.

that pump does about 750 lph thats about 12.5 lpm which is probably enough to do it but you may want something better Koolance offers a few reservoirs that support having two pumps in one drive bay unit. You can use one or two pumps, but in your case you would want to use 2 of their high end pumps for the best results. http://www.koolance.com/w...fo.php?product_id=2025

655/D5 would be my recommendation.  I have used it through about 8ish feet of tubing CPU, full cover mobo block and 2 580s with no issue, and 2 360 rads, works great. 
The XSPC pump, its ok, for smaller loops, 2 device and 1 360 they are great, but when you start getting into big loops it just doesnt have the horse power.  It does OK, and you wont overheat provided you have enough rad, but there are better choices for big loops.