I'm not sure that mobo will work, I think the aftermarket coolers need 2 slots of clearance, not just one (but I'm not 100% sure on that).
The reason for the aftermarket coolers is noise (and temps as an afterthought). I got a Gigabyte OC GTX 670 2GB last night, and in furmark after 1 minute, the fans were LOUD and temps were around 90C.... This is at stock speeds and fan set to auto.
This is in a silverstone ft02, so one of the better ventilated cases.
The reason I went with the GTX 670 route is it seems like the best bang for the buck with a slight overclock. I will only get one for the moment, and as games need more horsepower, I'll add another down the line.
Yes, I am using a 3570K. No issues to date, but I haven't overclocked it yet. I wasn't aware of any issues when using IB specifically to that motherboard. I know there are general heat issues when overclocking beyond 4.5 ghz iwth IB. I am not sure about 3 slots per card. I'll look when I get home. It does have proper spacing though for SLIing two slot card