Actually SU11YBEAR was right the first time, you won't be able to fit a H100i into that build, the reason being that it can't be fitted at the same time as an ODD, as you need to remove the bay to mount a 240mm radiator in the top or front positions.
If this is the basic config you want to proceed with, I'd suggest switching to the Corsair 250D (or look at some of the "coming soon" Corsair ITX offerings) as it's basically the only ITX case on the market which can fit the components you want.
If you want to stick with the Bitfenix, I'd suggest going for air cooling, as you can do high end air cooling without changing any other components. Even something as large as a Noctua NH-D14 will fit, though you'll need to tinker with fan locations to get everything to fit comfortably (this will depend a little on cable routing too).
As for your build overall, it's fine enough, but if it were me I'd certainly be looking to squeeze more from your budget, especially on the motherboard. The Impact is awesome, but it's so expensive, when you consider that something half the price does basically the same thing. I still want one, mind you.
It's also worth considering that the effective replacement for the 4670K is already here(ish) and the accompanying Z97 motherboards are circulating too (though the Z97 Impact hasn't arrived just yet) and they might offer better value/performance.
In general, 8Gb of memory is enough, but given the lack of expansion options and a healthy budget, going to 16Gb might not be the worst idea.
Also, given most of your build is high end, it doesn't make much sense to go cheap on a PSU. You don't need 750W either, somewhere around 600 is way more than sufficient. I'd suggest shopping amongst the Seasonic M12-II 620, Seasonic SSR-650, Corsair HX650, and perhaps my personal favourite, the XFX XTR 650. All are made by Seasonic, all are under $100, all have similar wattages, but there are a few variations on cabling and efficiency.
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