Why wait? I have had an Arkham Horror rpg going on for years. I use Arkham Unveiled, which has a big 3d map and is designed in a really fun way - the book works like a telephone directory with numbers on the map corresponding to entries inside. AH characters are very easy to convert, and most of the items too.
If you use rpg tools like Mythic and Mythic variations, you can even play solo...i can personally attest that the plots generated by these tools are capable of some *really* surprising twists. One game lured me into the woods investigating witch cults with a young girl looking for her brother that i was dating only to have her turn out to be my illegitimate sister, discovering that my father - a dentist - was also the head of a cult and the sire of 13. Of which i was eldest and was expected to take over after dad sadly completely lost his mind and never found it again.
This she explained casually as we made out under a tree. When i looked up, there were strange fruits, glistening entrails and bits of people up there...
Edited by dj2.0, 08 August 2013 - 11:33 PM.