Instead of paying and spend time learning another engine, just use that time to learn XNA. It will be the same time! At least it was with me...
It looks interesting. But I am still not convinced. Most XNA-projects miss good scene-management, lights and shadows. There are the usual problems with collision and rendering big worlds.
I have no problem to program my own AI system, but programming everything else like scene-management, light-system and much more is simply too much.
I also wonder why there are no big projects made with XNA.
