Shopping outside of USD is a struggle for time and finding the components is hard.
PSU: #1 NEVER get a cheap PSU!!!! A bad/failed PSU can ruin your entire system in a matter of a few seconds. IF OC only the CPU and not the GPU then 700W is fine, but if you plan to OC BOTH the CPU + GPU then IMO 850W. IF you plan on OC: CPU + 2-WAY SLI + PhysX then 1000W~1200W PSU. I like Corsair, ENERMAX and a few others; I prefer single rail, Japanese capacitors, and voltage protection -- I hate OCZ and Antec.
HDD: There's no advantages to a SATA3 HDD vs SATA2 HDD; zip. So I'd look at a 120GB SSD + SATA2 1TB HDD. To check 'speed' see ->
http://www.harddrivebenchmark.net/high_end_drives.html or search the model.
RAM: Assuming F3-12800CL9D-8GBXL they're okay for 2x4GB @ 1600 MHz, but in 4x4GB they often run @ 1333 MHz. So IMO F3-12800CL8D-8GBXM 2x4GB CAS 8 are a better choice and as 4x4GB easily run @ 1600 MHz
CASE: The Cougar Evolution black 'looks' fine but I've never used one.
From your post:
Intel Core i7-2600K Box, LGA1155
Corsair Hydro Series H100
Gigabyte GA-Z68XP-UD5, Intel Z68, ATX
WD AV-GP 1TB, 64MB Cache, SATA II
EVGA GeForce GTX 580
8GB-Kit G.Skill RipJaws-X PC3-12800U CL9
Cougar Evolution schwarz, 700W.....this case ist together with power sluply