Some people have been able to fit a proper push/pull (rad and push fans mounted inside the case and pull outside) system using the H100 and the 600T, but that all depends on the placement of your memory and your MoBo heatsinks. There are however many options you could look at.
Some people run a proper push pull set up with a slim fan pushing on the front half where the memory is for clearance. All fans blowing upwards, but you could reverse the fans and have them push/pull into the case (I would recommend modding your case if taking this route).
I've seen people put the rad on top (which required modding your case) and mounted the fans inside pushing out.
You could mount the rad inside and the fans outside (pushing into the case). This method does show advantage of pulling fresh cool air from outside into the case. I would still recommend that you mod the case getting rid of any of the mesh structure that may interfere with your airflow into the rad.
If none of these options satisfy you, I would suggest you look at the H80i instead if you still wish to take the closed loop route. You would then keep your 200mm fan on the top (200mm fans are nice since they move massive amounts of air at low RPM keeping them a lot quieter than 120mm.
There are still air coolers that perform just as well. Tests have shown them to be competitive to the H100 depending on settings sometimes performing better and sometimes worse, but always within minimal differences. Specifically the
Noctua NH-D14 and the
Phanteks PH-TC14PE (Phanteks is available in different colors).
One last note: If you plan on going the closed loop route, you should use SP (Static pressure) fans as they keep the airflow concentrated rather than spreading out in a cone shape.