It depends on what all you're trying to cool. If you're just doing a cpu and one gpu, or just cpu and motherboard. then you would be fine going with something like a Swiftech H220X. It's an all in one system like a corsair h110 but it comes with a reservoir/pump etc.. to allow you to empty it and refill it. You can also expand it into a full water cooling loop by adding more tubing and fittings. It's about $140 for the H220X and it's only a 240mm radiator so it fits fine in most cases. i know it fits in the corsair 760t so i'm 95% sure you'd have no problem with the 780t, in fact i think i remember seeing someone install an H220X in a 780t.
However, if you're going for a full big loop, like cooling the cpu, motherboard, two gpu's etc.. then i would say you should either look into a custom loop, or expand on the swiftech some more. For example, get the H240X if you're doing SLI gpu's + cpu etc.. since it's a bigger Radiator, then buy another 240mm or at the very least a 140mm one if you can't fit a 220; and mount it in back/front/bottom of the case.
So for example, your loop with something like an ASUS maximus formula that has watercooling would be Swiftech reservoir --> CPU --> Motherboard --> GPU --> 2nd GPU --> 2nd radiator --> back to the swiftech reservoir. If you aren't doing motherboard cooling you would likely be fine with just a 240X without another radiator even if you're doing cpu and two sli gtx970 or 980's. But doing two way SLI with any other gpu that has higher wattage like the GTX780/780 ti or R9 280X/290X etc.. would need another radiator due to the extra heat they give off.
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