Well, I just have plain 'ol DarkBASIC Classic (aka, DBC), and so far it has done what I wanted. I'm in the Works of creating a game---whose name I will not give out yet---and so far I'm using DBC 100%. Well actually I'm using Blender 3D to design some parts of the level, but anyway DBC seems to be powerful enough to begin with.
Do your self a favor: decide which one sounds best. IF you have the money for it, get DBpro. I assume you can learn just as fast and easy as DBC.
Signatures....peh. I never come up with anything good to say in them. Ah well.