Thanks all for the replies.
Basically it boils down to this, i want a new GPU, as you can see im running at 6950 Toxic, its been a lovely card but its time to move to something new, so im going for an Non Ref R9 290 Pro when they are released. I had decided on this before i watched or read up on any of the Mantle stuff.
Funnily enough i was toying with the idea of buying a PS4, which works out around the same price as a R9 290, but i own a PS3 which i hard play on, and figured the money would be better spent on the PC. So hence the R9 290 decision.
Now a few people said i would need to overclock my CPU to make sure i did not bottleneck the GPU, so i pushed the CPU to 4.4ghz, and its fine. So anyhow i see the Mantle stuff and it got me thinking, AMD are in the new gen consoles, their hardware is going to be pushing games for the next few years, the Mantle stuff looks awesome but we know relatively little on it, but what i did see last night is that it really benefits from more cores if you have them and if its the program has been coded to use them. Also currently the cost of an AMD cpu is much cheaper than the Intel counterpart on a relatively even keel of performance overall.
I mainly only play MMO's and FPS games, seeing as DICE are onboard with Mantle and a fair few upcoming Frostbite3 Engine games peak my interest (DA Inquisition, SW Battlefront) i figure AMD may hell have a bit of an ace up their sleeves with this whole concept.
So if i swap now to AMD, im not really losing anything performancewise, as i figure where the CPU might underperform on some games, the new GPU will overcompensate for me instead.
So thats basically it in a nutshell, as its a big GPU upgrade, swapping CPU at the same time i shouldnt really notice any loss in performance i reckon.