Man, that rendering takes ages!
30 cycles on a 800x600 picture took 38 minutes. I think i'll stick with SU exports with Rocane, because I really prefer that hand-drawn look that I get with my textures, so it's not worth the time rendering takes. However, I generally prefer that photoreal look you get from rendering a model modeled rendering in mind, I just won't get it out of Rocane, its textures being what they are.
Don't worry, though, those tips won't be wasted. They're making me want to start a new, more renderable, SU city. So, thanks for the tips. I think I really have to get a new computer first, though...