Look, if gaming is a big issue, then the i5-750 without even any thought involved... simple as that. If you are a particular gfx editor, then you can squeeze good juice out of the amd.
I normally would go for amd back in the day but in this particular case, those amd's mentioned and a similar priced i5 for gaming leaves the i5 as the only* choice.
But... going SLI with low end cards (well, let's face it, they ain't top end), is a waste .. again, all the tips of going the single card.. is the way to go.
However.. say it IS cheaper and you insist doing so.. ok... but then... even more so, if you do this for gaming... you get the i5.
If you are serious about the gonna last for years.. you are gonna cry over the AMD choice... it's a shame but it's a fact.. however, if gaming is not* top issue.. then ok... amd might be worth to get to save in on the bucks for the single gfx.
good luck