" I'm a well 3D modeller but in no one editor of this engine you get workflow ..."
Hm... even those who hate 3dgs say it is the easiest for the newcomers to learn.
Well... I guess with your"leet" modeling skills you should check out this engine
http://www.unrealtechnology.com/maybe there is a sybex version available

What exactly were you planning on doing with jpg images anyway?