Question is how much you want to spend to be honest.
The i5 750 offers same gaming performance as any quad core socket 1366 chip, more or less, but without the added cost. But if you are doing video encoding then the HT on the i7 chips and the i5 8 series would be beneficial if the software you use takes advantage of it.
I honestly don't think that the performance loss on the i5 is great with crossfire/ SLI, sure it has less bandwidth and maybe if you are running 2560x1600 res at 8xAA you might see a difference, but I don't really think it effects too much.
The X6 AMD is good for gaming, but for other heavy computing tasks you might even find a quad core intel running circles around it.
All depends on the cost. my ideal build would run with a i7 930 and 6GB RAM with a USB3/SATA 6Gbps motherboard, at the moment, or maybe an X6 with 8GB RAM and same spec board, but as a second choice at the moment.
_________________ P8Z68-V Pro | 2600K | HR02 | HD5850 | 2x4GB Vengeance LP | 128GB M4 + 6TB | X-Fi > HD595 | AX850 | Tai Chi | PB278Q | G110 + Deathadder 2013 P8Z77-V | 3570K | Mugen 2 | HD5850 | 2x4GB Vengeance LP | 500GB | X-750 | Fractal R3 | U2212HM | G110 + G400 P8H77-I | G860 | 4650 | 2x2GB XMS | 320GB | CX500 | Prodigy | T22B350EW | MX518 DC3217IYE | 1x4GB Vengeance | 64GB M4 | TX-42VT20E
|