I really cannot believe i came across another person having the EXACT same dilemma i have. I google'd 680 v 7970 triple monitors and came across this forum website so i had to subscribe just to add my two cents and hope to get both of our problems solved.
At the moment Im running a Power Color 6850 on a 1920x1080 Monitor giving me high specs on BF3 with good frame rates and other games running on high also but not ultra. However, I have 2 other identical resolution and model monitors waiting on the side to make a 5760 x1080 display i want. Knowing that my 6850 won't do anything with 3 monitors, i turned to Newegg to find a solution. Knowing that VRAM on triple monitors might be an issue if i went with a 2GB gtx 680 or 670, i decided to wait for a 680 4GB Model to come out and hopefully get that. Having my mind made up i was ready to buy the exact Galaxy 4GB model the OP posted, this last week on Newegg. HOWEVER, my mind has since been distorted by seeing TweakTown review the Toxic 7970. I feel that Nvidia puts a better GPU out on the market, but dealing with 3 monitors, i feel AMD's drivers and eyefinity trumps the gtx 680 whereas if i were using a single monitor, Nvidia all the way.
Before making the final decision however, i want to see the pricing on the models. I have enough money only to get 1 card and sli/crossfire later, and these GPU companies charge a large spectrum for little difference in their cards. Talking to the OP, I'm sure you have researched EVGA and have noticed that ranging from $500 dollars to $660, EVGA has like 15 different models of a gtx 680 with little difference between them. Galaxy, seeing how their reference design cooling system and factory overclock with a $570 price tag and 4GB of VRAM, looks like a steal. My problem is, is Galaxy a reliable company? Do they have good customer support and put out a product that will last a few yrs from now? I don't have an answer to that. On the flip side, the Ghz Edition cards are not coming out until Monday, and even then the Sapphire card may not be out. How much longer are we going to wait for it? In addition, what will the pricing be like? We know that the stock Ghz Edition card is 3GB and will be $500 but add a reference design, factory OC, and 6GB of VRAM, and now your sitting at probably close to $600 in my opinion not to mention vapor chamber cooling. Availability is another factor. Last but not least, I may not be right about this, but reading some reviews of the Ghz Edition, my speculation is the boost feature AMD installed just like Nvidia's Boost Clock, will always be at 1050Mhz even if the Core is OC'd higher which in my opinion is bad engineering. Like i said, i might be completely wrong about this.
Final decision: Just wait to see the pricing for the Sapphire card and do some more reviewing of the card on sites like TweakTown and then make your mind up.
In the last month i bought the following for my setup:
i7 3820 w/ Rampage IV Extreme Board (To wait for Ivy Bridge E)
32GB DDR3 1866 RAM
3 HP 23'' (1920x1080) LED Monitors
CM Storm Trooper Case
120GB Vertex 4 SSD w/ 1TB Caviar Black HD
H100 Liquid Cooler
1250W OCZ PS