CD had one witha PA160 on the top. I have a 240 in the front of mine, but when I would building it, I toyed with the idea of putting a 360 on the top. I was going to use spacers to raise the top bezel the height of the rad and "sandwich" the rad between the top and the case. It will take some modding, but it possible.
honestly, you're just as good looking for these than i am. all i'm doing to typing variations of "antec 900 watercooling" into google, which i think you have the skill to do too i'd help but i'm tight on homework for the next couple days.