Style 5's may be supposedly overdone, but on the road you almost never see them on cars. And they are easily some of the nicest looking, most universal (OEM) wheels ever made.
That said, the 17x8 square ones are the usual cheap ones. If you want to get fancy, they make a staggered 18 inch setup that costs significantly more. I actually had a 17" set of style 5's that I got for dirt cheap, that I completely refinished, sanding all the curb rash out and polishing them in the process, along with painting the bolts with gold metallic paint. Looked very good, though I never got to put it on the E90. (It was originally for my old E39 which I decided to sell)
18" Staggered Style 189 - BMS 15mm - CF Grilles - LCI Headlights - BMW Performance CF Intake - 12" Blaupunkt Subwoofer