System fan configuration

The best thing to do is get some really quiet fans. Then you plug them into the PSU cables. These fans will run at full rpm so make sure they are quiet. That is by far the best thing you can do. You'll be able to add as many as your case will allow.

You have 2 x 680s in a Corsair 300R? No way. It's too unbalanced. The 200R runs hot.
 
Use a splitter:)
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Sorry, thats not my computer, i just was showing an image of the case, i found it online. disregard anything that is not the case in the pic. Like i said i have 2 fans that came with the 200r case and i have only one fan header on my motherboard. I dont see how to plug a fan in a psu

 
i know i can buy a controller but im building it right now and i cant buy one right away. Can the computer be cooled decently with only one fan? if so what would be the best place to put it?