map builder

Miscellaneous Forums/Content Creation Tools/map builder

Cartography Shop. Great for the price, in my opinion.
Second on the list is, of course, 3d Studio Max. As for CodeD's comments on what hardware is good for 3d Studio Max, I'm running almost the same hardware ('cept I use a geForce 3 ti200) and he's not too far from the truth. It really does require a hefty pc, so to speak.
Maplet is, in my opinion, a poor editor.