Well, as for the case, I would step it up to either a low end CaseLabs (even though a low ends CaseLabs will be an insanely high quality case), and 800D, or 900D. This would cost more, but you could save money by getting larger sized SSDs. Instead of 10x 128GB SSDs, get 2x 512GB, or 4x 256GB SSDs. Look into the 512GB ADATA SX900, SX910, and the Samsung 840 Pro.
I would get a 1250W SeaSonic X PSU instead of the Cooler Master one. I don't trust CM for anything except cases.
I recommend EVGA Titans - in my experience, EVGA makes some of the higehst quality graphics cards on the market.
For you waterblock, unless you are sold on the EK Supremacy, I would get the Swiftech Apogee HD and set up a dual loop. The Apogee HD will outperform the Supremacy, and offers the ability to expand two a dual-loop, and considering you will have 2 Titans, it would be very beneficial for your temps.
You will want a more powerful pump. Idealy, you would want dual pumps - this is necessary for a dual loop. I recommend getting 2x Swiftech MCP35X. A single one will work fine for a single loop for your CPU, motherboard, and 2x Titans, but 2 of them will make all temps better and increase flow.
Personally, I don't like bay reservoirs; they cause too much air to be inside the loop. A 250mL EK RES3 will be fine. If you want a larger one, you will need more coolant to fill it up to make things look sexy.
I think you need more rad space. 360mm would be fine for 2x Titans, but if you want to overclock the crap out them, then I would get 480mm total. If you get a CaseLabs case, you coiuld put a 480mm in the bottom, but otherwise, you coulduse a 360mm and a 120mm, or 2x 240mm. Don't use 4x 120mm rads... That would just be silly :)
I recommend XSPC tubing. Try to get 1/2 tubing to accomodate the extra flow for that huge loop.
For fittings, I recommend DangerDen black compression fittings. When you get things like 90 degree pieces, or extrensions, you will end up spending a lot of money. A lot of people end up speding several hundred on tubing and fittings. Just get a single compression fitting that fits your tubing for each port on your blocks. :For the 2x Titans, you will be able to use an EK 2-way Dual Parallel bridge to connect them. You will need between 10 and 14 compression fittings, I belive. Get a few extra to be safe.
I would personally get Mayhems Pastel Red or Pastel White, but that is up to you. I think the pastel colors look better in clear tubing.
I recommend Noctua NF F12 fans if you are able to hide the fans, but otherwise, get Scythe Gentel Typhoon 120mms, or Corsair SP 120mm fans. Noctuas perform the best, but damn, they are ugly.
Hope I helped! If you have any more questions, I will be more than happy to respond.
-Brennan Riddell