I went with a similar system to your proposed system.
Being in Canada, I paid a bit more...

I went with a Corsair 1050 PSU; I like how it is modular, allowing you to only use the cables you require.
I probably don't need 1050 watts, but that future proofs the system to a degree.

The processor and motherboard are the same.
Rather than liquid cooled, I went with a Noctua NH-D14; that forced me to use low profile ram... but I don't need to mess around with liquid, and it is a cheaper option.

I also opted for 32GB of ram, but went with Corsair Vengeance (Low Profile) 1600Mhz CL8 (8-8-8-24).
As long as your ram is Quad-Channel, 1866CL10 is comparable to 1600CL8 in all the benchmarks I could find.
I went with 1600 because that's the highest frequency supported by the processor, without overclocking the ram.
I looked at G.Skill ram, but Corsair has treated me well in the past.

I went with an eVGA GTX670, 4GB Superclocked.
On the Tom's Hardware Graphical Hierarchy chart, they're the same relative power; my card seems a bit more expensive, but has 4GB as opposed to 3GB.

I had an OCZ Vertex 3, 120GB already.
So added a second, and did Raid 0 with them.
240GB SSD, but two drives instead of one for my OS/Gaming drive.
Access should be faster with two 120's striped, but I lose the TRIM command.

I opted for a Blu-Ray burner instead of a DVD burner, mainly to be able to watch Blu-Ray's on the system.
I didn't know you need a program to view Blu-Rays, which essentially doubled the cost of the drive.

I went with 6TB's of storage, but a 1 TB storage drive is plenty, and hard drives are cheap if you need more.
Plus you can always use an external USB 3.0 drive.





So far haven't really played with it much, beyond configuring the UI on a few teams.

Hyper-threading made a significant difference, going from an i5-2500K to an i7-2600K.
Cores mean quite a bit boxing; having six physical cores for ten accounts will be nice.