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.
Balkhan - I don't think so, but I'm wondering if it is possible to fit one xtra fan on top as a pull, as I believe there is at least room for one fan? Anybody?
I just finished installing the H100i in a push/pull config at the top of the case. One fan pull will probably work without modifications. But I was dead set on getting it running push/pull so I modified the case a bit. Basically what gets in the way is one of the mounts for the handle. I removed the bracket that the handle was attached to in order make room for one of the fans. It is riveted so I just drilled out the rivets. Once the bracket is out you have just enough space to fit a fan into position. When the top is on the handle rests on one of the fans. Obviously this isn't ideal but as long as you are aware that the handle has been modified you can just avoid using it to move the computer around. I suppose you could make a new bracket also and attach it using the holes from the rivets and retain the safe use of the handle. Just having the top on keeps the handle in place anyway.