So, I was browsing a number of options, and I thought -- why not get members of the GTA Forums Modding Team, and make a standalone project in Unity?
Basically, Unity is a 3D Game Engine that is somewhat simple to use, and uses a WYSIWYG Editor.
For modeling, you can import an .OBJ, .FBX, .3DS, etc. The list goes on and on.
So, what do you guys think?