Just to be safe, I just ordered the 860W version, not the i version though because it added another £35-40 onto it, and I myself don't fancy tinkering around with power supplies, I'd blow it up!
Cheers guys! Only RAM and GPU left to buy, I'll deffo buy the RAM at the end of the week, but I'm sort of holding out on GPU until last minute, and I'll buy then, as long as my rig is built, OS installed, drivers, configured and all running smooth in time for BF4 thats fine.