I have the same case and am about to have the thermaltake water 2.0 extreme (about the equivalent as the h100).
You would in fact install the rad on the top exhaust, but with mine I dont think that i can put a push/pull on it due to the radiator sticking out too far from the top and hitting my water block.
Unless you customize your case to house the rad on the outside, removing the top fan and installing the rad there is the only place for this case.
but also, remember that hot air rises. So the fans blowing down is probably your best bet. Seems like that would cool the case more, but it just wouldnt make sense since the back of the rad will be up at the top exhaust anyways.
You want the fans to be blowing air UP through the rad and out of the case. As Flakkattack mentioned, hot air "rises". Have your front fans blowing in as well as side case fans (if you have them) and have the top/back fans as exhaust. Thats how I run mine.