Building the most powerful and smallest possible gaming PC

[darkknightkryta]

CGI-Quality said:
Since you're the one who knows a bit more about these parts than me, forgive me for the off-topic, if you could go with two GTX 670s or one 690, which would you buy?

Isn't the 690 tehcnically two 680s?  But I guess two 670s would be cheaper.