Every MOBO has it's 'Ideal Use', for the UD7 it's 2-WAY x16/x16 or 3-WAY SLI/CF with ultra-high-end GPUs in mind. The UD7 {GA-Z68X-UD7-B3 or GA-P67A-UD7-B3} offers incredible 24-Phase power that yields excellent low vCore voltages. Whereas the UD5 in particular GA-Z68XP-UD5 has 20 Phase power and NATIVE x16, x8/x18 PCIe. On single GPU x16 Native 100% beats NF200 x16; the NF200 real purpose is 3-WAY and the x16/x16 + NF200 vs x8/x8 + Native even on GTX 580 is a toss-up. The P67/Z68 Native cannot 3-WAY; there's only 16 PCIe 2.0 lanes to the SB CPU. However, the new SB-E/LGA 2011 has 32 PCIe 3.0 lanes NATIVE to the CPU {quadruple bandwidth}.
IMO the GA-Z68XP-UD5 + GTX 570 or ~+$20 is a
NO BRAINER!!!!
Can you play all games on a GTX 560 at max settings with good >45FPS = NO! Even the GTX 570 struggles on some games at high settings. ANY PCIe 2.x GPU will 'work' on ANY PCIe 2.x and most PCIe 1.x MOBOs.
There's NO FUTURE PROOF ANYTHING. In a matter of weeks (8~10 apx} the LGA 2011/SB-E will run circles around the current LGA 1155 {CONSUMER GRADE} and Sandy Bridge CPU by a factor of 45%+. The LGA 1156/1155 intention is/was to be consumer whereas LGA 1366/2011 is extreme/high-end, and the cost differences are modest.
Regarding SRT, simply don't use an SSD as a Cache for the HDD. It's better by 200%~400% to use a fast dedicated SSD with at least 120GB for {OS, Apps and Working Data} plus a HDD(s) for {Data Storage and Archiving}.
Here's what 'I' would build; note prices vary daily:
Z68 Build: Hyper-threading, Fast SSD, RAID 1 HDD, GTX 570 for Adobe, 16GB RAM, etc.
Type Price Description Link
CPU 315 Intel Core i7-2600K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115070
MOBO 200 ASUS P8Z68-V PRO
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131730
GPU 330 EVGA 012-P3-1570-AR GTX 570 (Fermi) 1280MB
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130593
RAM 105 CORSAIR Vengeance 16GB CMZ16GX3M4A1600C9
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226184
SSD 200 OCZ Vertex 3 VTX3-25SAT3-120G 120GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227706
HDD 60 SAMSUNG Spinpoint F3 HD103SJ 1TB
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185
HDD 60 SAMSUNG Spinpoint F3 HD103SJ 1TB
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185
PSU 166 CORSAIR Professional Series HX850
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139011
CASE 88 CM RC-692-KKN2 CM690 II Advanced
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119216
OS 140 Windows 7 Pro SP1 64-bit - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116992
ODD 22 ASUS 24X DVDR - Model DRW-24B1ST/BLK/B/AS - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204
HSF 58 Thermaltake Frio
http://www.newegg.com/Product/Product.aspx?Item=N82E16835106150
Total 1744
Options:
PSU 216 CORSAIR Pro Series HX1050 (2-WAY GTX 570)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139034
HSF 126 CORSAIR H100 Liquid CPU Cooler (4.6GHz +/new fans)
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181017
MOBO 279 Gigabyte GA-Z68XP-UD5 (2-WAY)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128513
MOBO 269 ASUS P8P67 WS REVOLUTION (3-WAY+PhysX)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131714