I swapped out the front fan for a NZXT 200mm fan. However the screw holes don't match with the corsair holes. (Will post picture later.) The NZXT fan is a little louder but i feel the extra air flow is worth it.
I would personally go for a corsair hx1000. I have had an incredible support experience with corsair. An example is when I needed extra Sata cables I sent them an email new cables a couple days later no charge
if you are looking for any SLI mobo none of these will work.
These have Intel chipsets, you need one with an Nvidia chipset.
If you are looking at that price range then i would recommend Evga's 680i mobo
that is one that works with SLI