re: Build the Best Gaming PC Your Money Can Buy: A Detailed Guide (Updated Sep 2014)

Thanks, I'll give the CPU section a read for those typos.

In general, it's best to go with the best single GPU solution you can afford -- mostly for the sake of being able to make a more significant upgrade for less money later (i.e. buying a 780 and adding another one later when they are cheaper), and partly because multi-GPU solutions are imperfect -- but drivers have improved this to a near-solved state, and new games are much better optimized for SLI/Crossfire than ever before.

Two 760s, performance-wise, are most certainly going to beat every single GPU solution. An SLI setup will consume more power (so follow the guide on PSU selection) and will introduce more heat (can be mitigated with proper case airflow configuration).

Also consider what kind of performance you hope to get. If you're gaming at 1080p 60Hz, you will be able to run at max settings, 60+ fps in pretty much any game, regardless of whether you choose a $500 single GPU or two 760s. In some games like Crysis 3, which puts a ridiculous strain on even the most powerful cards, it's the hardware-based antialiasing that significantly reduces framerate, so much so that the extra power from the two 760s won't make a difference.