I think that the Apogee Drive II is a good idea, although it is essentially an Apogee HD with an MCP35X mounted to it and without the 2 extra ports. If you already have an MCP35X, I don't see the need for the AD2.
I like the idea of white and black (my whole build is white and black), but if I would have sleeved the entire PSU myself I may have added a splash of color. The best way to determine a second color is by looking at what the most common color on your MB is, IMO. Since you are using the Sabertooth, that leaves you prettywde open. I think white would look good regardless of case color since you will have so much black elsewhere, but I don't know what would be good for a second color other than black. That's where the uniqueness of a self built computer comes in.
I don't have a Lamptron (Bitfenix Hydra Pro was what I got, and it's a completely perfect match for the case), but I imagine that it is likely just one 3pin cable per channel. You can use Bitfenix Alchemy 1x3pin to 3x 3pin splitters to keep rad fans together on one channel, which is what I did for my top radiator (3 push on one, 3 pull on another) and Phobya makes 1-to-4 splitters, which I am using to keep all 4 of my bottom rad fans on a single channel, although with 8 channels on your controller you can just use two Y-splitters and have the bottom rad fans separate like the top.
For case fans, I would say go with the strongest fan whose noise level is acceptable to you, as you want to ensure that the case airflow is more than adequate for both feeding rads as well as cooling the VRMs/MOSFETs on the MB, the RAM, HDDs, etc. 140mm fans will be ideal for this as they generally move more air at a given speed than a 120mm fan can. Static pressure is still important, but not as much as with rads; you need to have large volumes of air flowing through the case. Intake fans that have to push through drive cages and filters benefit most from static pressure, but it doesn't need to be much above 1mmHg for good cooling. I would suggest doing the math to figure out what your exhaust fans (including those on rads pushing out) total in terms of CFM and then making sure that you can push around 20 percent more air into the case with intake fans, thus maintaining positive pressure. I typically look for at least 70-75cfm for case fans, but the more air pushed at full speed, the more you can turn them down without hurting case flow.
I am waiting for the 140mm Bitfenix Spectre Pro PWM fans, and will replace my case fans with those, but other good ones would be the Cougar 140mm, NZXT FX140LB and FZ140LB, Bitfenix Spectre Pro, Scythe 140mm fans, and so forth.
For the PSU, I would get an 850W unit (and I did), as it will be plenty for dual GPUs even overclocked, and in the meantime you will be keeping the PSU loaded right in its efficiency sweet spot. That means less heat, and less wear on the unit. I don't see any need for anything higher, but I would worry that 750W may just not quite be able to handle 2 GPUs + 3930K + water cooling... It would depend on the unit, but I think that the extra 100W of the 850 is a good amount of headroom. JohnnyGuru has the absolute best PSU reviews I have ever seen, although TechPowerUp does a good job as well. Trust them, and don't buy one until you know everything about the unit, as buying by brand can result in a terrible unit from a usually respected company. For example, the incredible HALE90 850W from NZXT vs the mediocre HALE82 from the same company. The internals are what matters, and the stickers on the outside are about as useful as a screen door on a submarine