What 3d engine would suit the game I'm designing?

What 3d engine would suit the game I'm designing?

Game:  Rpg 12 regions, over 1,000 screens of graphics. big outdoors game, 2d 3d isometrical view.   Don't know which engine will suit it, because I have to know which engine can meet the requirements of the game can't just use any old engine.

I looked at Reality factory, Genesis Engine, layout is a little bit confusing. And also looked at Adventure Maker, now that DId let me link my bitmap screens up but the basic edition will not allow me to script in my own pawns.   That Engine had a simple easy layout.

Batch did allow me to move about screen by screen in the game and script the battle scenes so I could see what the game was going to be like. when screens are all linked up... But batch is not 3d interactive.  .But it should be possible to turn my batch code into other language code.  I don't know how to make the batch game become 3d interactive since batch dosen't even have a 3d game engine. So i can't have moving sprites and 3d models and a scrolling game terrain to walk around in unless someone makes a breakthrough to allow it to be done in a batch file.   I need one that can tile 1,000 screens but tile them gradually as the player moves from sector to sector through the regions, (seamless backloading) use distant fog to hide the rendering. ect........

So guys, What game engine out of the very many that are avaliable on the internet can handle a massive 12 region game?