I7-3930k with x1 Radeon 7970 or i7-3820 with x2 Radeon 7970

Get i7 3820 with 7970. It will be a monster

But you don't need that high-end processor for gaming. I suggest to get i7 3770k if you don't do any hardcore software work. Even i7 3770k is very good for all those.

Go for the 2 7970s. You'll find that you'll be more stuck for graphics performance rather than processing performance. Unless you do some hardcore video rendering and such.

As you'll just game, Get a i7 3770k with 2x7970.

The money you just saved from downgrading to 3770k, use it on a Good SSD. Its totally worth it.

If your are getting 2x 7970 (Not the Ghz edition), then rather get GTX 680 SLI. Its too worth the price.

For gaming neither.

i5 3570 k. A good cpu cooler and gtx 670 SLI 4 gb or the 2x 7970, but be advised that there isn't a single game that can't be run with either of these solo, with pretty much everything maxed.

I've heard alot about Stuttering in Cross-firing the Radeon 7000 series. So I suggest better to get GTX 690 or GTX 680 SLI.

Radeon Pro covers the micro-stuttering, and actually provides better performance than SLI.

From what I've seen, 7970s provide better performance overall, but go with what you like. From a getting perspective though, two GPUs will serve you much better than the 3930.

Thank you for your advice, but the GTX 680 SLI cost too much. I think I will stick with 7970.

Do you think this looks ok?

-CPU: Intel® Core™ i7-3930K Six-Core 3.20 GHz 12MB Intel Smart Cache LGA2011
-VIDEO: AMD Radeon HD 7970 3GB 16X PCIe 3.0 Video Card
-HDD: 128GB ADATA SP900 SATA-III 6.0Gb/s - 550 MB/s Read & 520 MB/s Write (128GB x 2 (256GB Capacity) Raid 0 Extreme Performance
-MEMORY: 16GB (4GBx4) DDR3/2133MHz Quad Channel Memory (Corsair Vengeance)
-MOTHERBOARD: (SLI/CrossFireX Support) ASUS Sabertooth X79 Intel X79 Chipset Quad Channel DDR3 ATX w/ TUF Armor, SSD Caching, 7.1 HD Audio, Intel GbLAN, 3 Gen3 PCIe X16, 2 PCIe X1 & 1 PCI
-POWERSUPPLY: 1,000 Watts - Cooler Master Silent Pro Gold 80 Plus Power Supply ( 80 Plus Gold)

For gaming and watch movies that cpu is a waste of money, just get the i5-3570k, 8GB DDR3 1600 mhz, a 850w psu from seasonic, xfx, corsair, a z77 mobo (asrock extreme 6, msi mpower)
The ssd also change for a single 256GB from samsung(830 series) or crucial m4.
For the 7970, get a 7970 ghz edition sapphire vapor-x.

i5 is enough for gaming? and btw why single ssd 256GB, but not 2 120GB raid 0?

Replace CPU with i7 3770k (Very similar performance in gaming) (Saved 250$)
Replace GPU with GTX 680 SLI or GTX 690 (Use those 250$ saved form CPU)

Stop being a fan-boy of Nvidia...

I'm not a fanboy. I'm trying to help him, I'm suggesting him the best in the range.
GTX 680 rules that range. 7970Ghz edition is OC, so you should OC your GTX 680 then compare.

And getting Crossfire in 7000series mainly is resulting in stuttering. Not all are getting but some of them are.
So its safe to get SLI and features like TXAA, Adaptive V-sync. These features improve your graphics without compromising with performace.
High-end GPUs are brought only for Good Graphics and Performance.