The Coolermaster 340 is a good case, it fits two 120mm fans and a big cooler. Fitting three hard drives is going to be very tight.
The Corsair H50 is a good integrated watercooling solution, but no better than a high performance air cooler. I would recommend a Coolermaster Hyper 212+. Passive cooling for an i7 is impossible, but either the Corsair or the Coolermaster with a slow fan should work nicely.
I assume the main purpose of this rig is gaming. Unless your going for more than one graphics card, an i7 860 is equally fast in games than a i7 920 above a 1024x768 resolution and consumes less power. A s1156 mATX board is also cheaper than a s1366 board so you have more money for a faster graphics card.
Go for an i7 860 and a Gigabyte GA-P55M-UD2.
Cooling a high end graphics card silently is even more difficult. The Thermalright HR03 series is the best cooler, but it's too big for an mATX case. You can use the Thermalright TRad2, Scythe Musashi or Arctic Cooling S1 R2.
Another problem with high end cards besides cooling the GPU is cooling the VRMs. Thermalright makes VRM coolers, but it's only specified for the 4870 and 4890 series, which are slightly inferior to a GTX285. The Ati 57XX series has the same mounting holes next to the VRMs as the 4890, but I don't know if the VRM cooler actually fits, so I won't recommend it but feel free test for yourself and share your findings.
My recommendation for a high performace silent graphics card is the ATI 5850, just as fast as a GTX285, with an Arctic Cooling S1 and the black plate of the original cooler for the VRMs. You will have to bend some fins of the cooler so they don't hit the second DVI port and you need to use a fan. A slow 120mm fan will do fine, again passive cooling is out of the question. Here's a pic:
Pick any 400+ watt PSU from the recommended list for your system.