Don't think about prize it's should be last thing on your mind, instead give some ideas, ORPG can be anything...
Also do you realize that ORPG maps are the most complex for creation, often teams of users try to create map like that and get lost in process...
Good ORPG map can't be created in 1 month or 2, it take years for perfection!
Better go for SPRPG, you don't need to care about MPI and MUI, you will have more and more easier options here as well.
It will be easy to create even for starters. Still map quality won't be so epic after month or 2...