I know you said not to reply about how crappy the kits are, but yeah...
Buying the Bigwater for GPU purposes, especially if it's only temporary, is a lot more hassle and you'll end up spending a lot more on the price tag than what you may think.
The Bigwater is made for CPU cooling, it only includes a CPU block therefore you'd have to buy the GPU blocks seperately. Add the $150 pricetag of the BW to the cost of two MAZE4s at $80 (do not go with TT blocks) and you've bumped the price up to close to 250 bucks, you have a useless CPU block, and you have pump that will struggle to provide good flow through your blocks.
In addition, you'll either be getting 3/8" or 1/2" fittings for the blocks, assuming you'll be transfering them over to your "permanent" loop. This means you'll have to do a bit of fitting adjusting on different components to get everything to fit nicely.
For about 250 bucks, you can get a D4 Pump, GPU blocks, rad, and tubing and fittings that will easily outdo the bigwater. You're spending virtually the same amount either way, but you can stick with BW if you want.
Intel C2D E6320 / AMD Athlon X2 3800+
Gigabyte 965P DS3 / DFI nF4 Ultra-D
2GB OCZ Gold PC2-6400 / 2GB OCZ Gold PC4000
eVGA 8800GTS 320MB / eVGA 6800GS 256MB
150GB Raptor / 74GB Raptor
2x500GB / 320GB
OCZ GameXStreme 850w / OCZ StealthXStream 600w