No I definitely cannot afford professional. I might be able to afford commercial, but I would have to make some sacrifices in order to do so. That is why it is so important that I make the right decision. I don't want to buy extra if it will not be sufficient for my game needs.

I would say that if I had to make an absolutely crucial priority it would be the size of my outdoor levels. My game is going to be a mechwarrior type game so I would need lots of room.

Thanks for the reply. I can see that you have been using the engine for a while so I can trust your experience.