direct quote from member lehpron from the EVGA forums, sorry its huge but this sums up why i chose the type of mobo, GPU and CPU. but of course still subject to change
"Most modern games are threaded for between 2-4 cores, and it has been a slow progress adoption since quads have been around for six years, duals for eight years. meaning, a 6-core won't make a difference today. New games take 2-3 years to make from the ground up, so in that time, it will make a quad that much more important. Only get the 6-core for your professional work, not for gaming.
3770K is a 22nm quad and half the die area (thus half the actual power and thermals if set at the same frequency) as 32nm i7-3900's 6-cores; mathematically, they should overclock better, but Intel differed from tradition of soddering the CPU die to the IHS (integrated heat spreader) by using a thermal grease with Ivy Bridge which tends to artificially raise temperaturess. This prevents anyone from really being able to push it except for those using cryogenics; so in the end, all Sandy and Ivy processors reach a max of approx 5GHz regardless of number of cores.
So it all comes down to the board really; X79 can support up to 4-way SLI (in quad x8, or a pair of full x16) configs while Z77 is limited to just dual x8's. If you're serious about longitivity in terms of having the room for future graphics cards and not change the board (which definitely need more bandwidth than current), then X79 is the only option. For CPU, either get quad 3820 or 6-core 3930K depending on how often your professional uses need 12-threads or not.
BTW, as for the GTX670's, get the 4GB card. We'll soon see a new standard for mainstream monitors that used to be the reign of medicial professionals, their total single display res equals to a modern multi-display setup. So if you intend on at least one in the next two years and not upgrading graphics for it, then you should plan ahead with a 4GB model and get 3-way SLI by then to compensate.
Really looking for longevity and durability I chose a gtx 670 in hopes of being able to run graphic intensive art programs and gaming on high settings for at least two years before upgrade/new build.
This part will require an edit for realism.
In two years, a pair of GTX670 will have the performance equivalency of a future mainstream card (i.e. "GTS850" )and unable to run those games appearing then at high details without having the frame rates dip whatever is high-end at time. So either plan to get into 3-way or 4-way SLI (meaning you need to get a 4-way capable board in the first place, i.e. X79), think about upgrading your graphics card much earlier than two years, or settle for less visuals as times passes especially if you plan a higher resolution monitor someday. Most games are GPU-intensive, so if your resolution doubles the pixels, you cut your frame rates in half.
The only way you can truly have longivity is if your expectation is much lower than what is available for purchase. If you want max detail at smooth rates, then that is only possible today, it isn't possible next year with this year's configuration running next year's games. Just so you know, many folks on enthusiast websites like these upgrade often as a hobby, they choose to keep up with technology in order to maintain their preference level in every new game; I personally see it as a hassle. So you have to decide your upgrade tendencies beforehand and plan ahead, beyond this upcoming build. "