Apologies as ive been living in the Core 2 Duo days !
Its going to be put into a new rig (which im still working on, obv a lot depending on the CPU) used for gaming, im looking for very high end graphics (i understand about GPU commitment) and likelihood of survival in the future of CPU's ... always a good price-quality ratio =D
For the GPU side, ive got my head set at 'HD 4870' x2 for price-quality ratio ? OR maybe 'GTX 460' x2 ?
The high end i5 would do anything a standard user needs. Not to mention i5 750/760 can OC easily to 4.0ghz (depending on the Heatsink) The 750/760 would be your best choice though as they are quad cores for a great price.
Your gpu solution Crossfire 5770's would be good as they equal one 5870, and that just 300$ equal a 400$ card. But the 460 GTX SLI also scale well as two is 400$ and equal a 500$ card. They both scale well and 8x/8x mobo would change much as 8x/8x vs 16x/16x is only 1-2% difference, not even noticeable. I personally would go with 5770 (XD I'm an ATI fanboy) but, the best bang for buck is the 460 SLI, or save some dough and go with the 5770 Crossfire.