Did you check the dimensions of the case?
You bought a micro atx case. You don't need to buy an expensive mini itx motherboard.
The ax series is the top of the line corsair series. You don't need anything like a 760 watt psu for a system with a 750ti which is a very low power draw card to begin with. I would buy a more midrange power supply and something in the 500ish range. I just recommended a SSR-550RM seasonic G to someone else and it would appropriate here. I don't feel you need a top of the line power supply for this build and that is really oversized for the machine. In fact you could get the 30A 12v 360 G SSR-360GP.
I would forget about liquid cooling and use the stock cooler or, if you don't like that idea, a more standard air cooler such as the coolermaster hyper 212
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www.newegg.com/Product/P ··· -ProductWe can talk specifics about the motherboard if you accept that you don't need a mini itx board