If you're on a tight budget, you could look at one of the xspc rx360 kits and simply adding a gpu block. That's what I started out with (althought I have the RS) and I added a second 360 rad and both gpus to the loop. Since its more of a kit instead of a closed loop you can change the pump...
I personally use a kill coil and have no issues at all. Really its half doz one way and six the other. Just dont do either if you have nickel plated blocks, I have heard that mixing the silver or copper sulfide might have been a culprit in the whole "flaking" fiasco