The ex kit isn't available in the US yet, and the Rx is too big for my case. I'd have to mount it to the back, which i don't want to do. But from what I understand I'll be fine with the Rs 360 on an overclocked i7-2600k. my roommate gets 4.6 ghz on a mid level air cooler. So as long as I get a good chip, I'm sure I'll easily get that or higher with much lower temps.