After doing quite a bit more reading today, Cathar's thread on the impact of tubing sizes, the swiftech MCP35X thread, the fan testing thread, Gabe's posts regarding dual vs single loop performance,

I'm now thinking that a single loop using 3/8" ID, 5/8" OD tubing is the way to go, and the Gentle Typhoon really impressed me with its performance relative to the other quiet fans, so I've decided on that part at least.

As far as bay reses go, I'm not sure if any of the options currently on the market fit exactly what I'm looking for. The Moonsoon looks pretty much ideal, in a pumpless version, but isn't available quite yet.

I'm also contemplating modding the top of the case for a MCR420, either that or figuring out if I can squeeze a MCR320 in the bottom somehow.

In short:
CPU Block: Undecided between Swiftech Apogee XT and EK Supreme HF, one has the better mounting system, the other has slightly better temps when mounted properly, and accomodates larger compression fittings (ie, 3/4" OD tubing).
GPU Block: EK 580GTX Full Cover block
Rad: Swiftech MCR320 for the top of the case, if needed MCR220 for bottom of case.
Fans: Gentle Typhoon AP-15s, not sure if I need to find a good 140mm fan to replace stock ones or not.
Pump: Swiftech MCP35X
Reservoir: A bay res of undetermined type most likely.
Fittings: Compression Fittings (Bitspower or Fesser most likely) for blocks, pump, and reservoir, and a t-line leading to drain plug.
Tubing: Clear tubing (maybe UV reactive) 3/8"ID 5/8"OD (Primochill LRT or Fesser?).
Fluid: Distilled water + PT Nuke and/or Kill Coil

I'm getting there... only a few blanks left to fill in.