are u going to unwrap and texture the models? If you have photo real stuff in the background then the city has got to match it so it blends together. Otherwise it looks too pasted in. You could compromise and set some blur the further the background gets away to give the illusion of depth.
Thanks for the positive feedback.
I think (for now) that i will go with the blur and use more fog (dust) in the air to make the background disappear even more.
The background is a CGI made with a fractal 3D composer program called terragen, and is not photoreal, although i must say the result is quite convincing.
