Ok I think there is some confusion here. The Swiftech H220 is different from other "AIO" coolers for two major reasons:
1) You can detach the hoses that connect the pump and radiator so that you can add more tubing, radiators and waterblocks along the way.
2) The pump is much stronger and is capable of pushing water through most watercooling loops.
Coolers such as your H80 can't be expanded to accommodate waterblocks since the tubes are permanently affixed between the pump and radiator. There is a technique to cool GPU's with Corsair H60's and H80's but it's pretty ghetto (search "The mod").
A Swiftech H220 is a lot like an XSPC Rasa kit, except that it comes totally assembled and filled to cool just your CPU. Should you wish to cool more than your CPU, you would have to break it open, and essentially turn it into a fully custom loop, which it sounds like you don't want to do.
In your situation, I might suggest finding aftermarket air coolers for your 7950's and sticking with your h80 for the CPU. Otherwise, if you want to go full WC, don't even bother with the H220. Instead, do a WHOLE lot of reading, look at build logs and pictures, think of how you would run your loop and learn what all the components do. Do NOT jump into custom WC without doing research (and some extra cash for when stuff hits the fan[literally and figuratively]).
Best of luck
Edit: I just saw that you have a Thermaltake level 10 GT. I don't actually think that supports a 240mm like the H220 one. I hear in general that your case has very poor watercooling support, so that's something to bear in mind as well.