When they say a single gpu solution is always better they are right get the 7970 toxic edition it is the strongest single card on the market and should about perform very well in gaming. It is safe to say you will be able to play almost anything on full settings with 60+ frames a second for a long time. Also I would recommend getting an i5 3570k. You don't need an i7 for gaming also you don't need a liquid cooling system unless you do some major over clocking and wouldn't get it unless you really need to. The thing is with a 7970 toxic and a 3570k will get 60fps. Most tv's and monitors can only do 60 frames per second.
@lt_dan_zsu Yeah bumping the i7 3770k down to a i5 3570k should be just fine for what I plan on using the computer for. As for the 7970 toxic edition if that is the one your talking about. I wasn't aware that it had even been released yet. Which isn't really a problem if it is coming out soon i'm willing to wait it does look like an amazing card.
@Smorizio not quite sure what you mean might just be me being a noob but the CPU I picked was already and IB.