I think I've narrowed down my list for GOD to just three: Spirit of the Century, Agon, and Don't Rest Your Head. I'd honestly like to run more, but I think I won't be able to practise enough between now and then to ensure that I can run a decent game.
Honestly, I think that DRYH will be the most difficult of all of them for me to run, because it is the least crunchy of the lot. Agon has such a simple heroic premise that it's easy to ensure group motivation. SOTC is similar in that regard, but DRYH is the one that still confounds me a little.
Sounds like a worthy challenge, if you ask me.