Two loops - that's so much work and you are limited by the case. I figure that you're only going to be able to use, at best, a dual 120mm rad - in the back, outside, mounted with a radbox kit.
I'd hate for you to have to use something like the Reserator, not because I think ill of that particular kit but, because it is just another mess to add and it would also greatly increase your expense. So, let's try and work everything in one loop if possible.
There is a new pump that just came out - the MCP355. It is extremely powerful and no more expensive than other comparable pumps. It's a 3/8 ID pump (which would work for you). The only thing is that it is supposed to output up to 32dBa in sound - which is very noticeable. I am convinced, though, that if properly mounted, it could reduce the noise factor. I would use the foam sticky pad that comes with it but forgo bolting it down and just see how that does if you get it. It's the perfect pump for what you want otherwise - small, powerful and optimized for 3/8 ID loops. The alternative is the MCP655 - which is made for 1/2 ID loops but can be used by employing 1/2 to 3/8 reducers.
Since we are going to focus on getting you as much of the flow as possible, I'd also suggest the Swiftech Apogee for the CPU. The Storm is more favored by enthusiasts but it is a much greater restriction to flow.
The major purpose of the northbbridge is to run communications between the CPU and the video ports (pci, agp and pcie) and it also coordinates memory functions between the CPU, the FSB and your ram. You are using an Nvidia chipset board so you don't really need to add a northbridge waterblock to the loop because the on die memory controller of the AMD procs. That takes some of the use of the northbridge away so they run cooler than Intel chipsets. A decent HSF would do.
So, following this plan, you have a CPU waterblock and a GPU waterblock. You would be using 3/8 ID tubing and either the MCP355 pump OR the MCP 655 (with reducer). For your radiator, a tried and true Black Ice Xtreme II. As for a coolant, you'll need to decide between a water additive like Hydrix or the more expensive non-conductive coolants like PRIMOCHILL ICE.
WATERBLOCKS:
AquagraFX ($160)
http://www.sharkacomputers.com/aqcoaq79gx2.html
Swiftech Apogee Extreme Performance block with AM2 Support ($50)
http://www.sidewindercomputers.com/swapexpebl.html
RADIATOR:
Black Ice Xtreme II Radiator ($43)
http://www.dangerdenstore.com/product.php?productid=2&cat=85&page=1
TUBING:
Tygon 3/8in. ID 1/2in. OD Laboratory Tubing #R3603 ($1.65ft)
http://www.sidewindercomputers.com/ty3id1odlatu.html
CLAMPS:
Breeze Miniature Hose Clamp 7/32 in. to 5/8 in (10/$3.60)
http://www.sidewindercomputers.com/brmihocl7int.html
PUMPS:
Swiftech MCP655 ($77)
http://www.sidewindercomputers.com/swmc12vdcpu.html
Reducer for MCP655 ($4.50) You'll need 2 (1/2 ID to 3/8 ID)
http://www.dangerdenstore.com/product.php?productid=71&cat=23&page=1
OR
MCP355 ($80)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=201&products_id=20655
I'd advice you to read on this pump concerning the audible noise factor.
Here's a link to the manufacturer:
http://www.swiftnets.com/products/mcp355.asp