I disagree with the cars comment. Anything hard surface is a lot easier using nurbs and I think MOI should be able to handle it fine . I think polys and subd's are nightmares when trying to cut holes in surfaces while trying to maintain the overall smoothness of the surface.
If you want the ultimate render quality/speed ratio I would go with Fryrender. Easy to set-up and use, great library of pre-existing materials, rhino-plug-in, unmatched unbiased quality at great speed (given a decent rig of course)