Yes, you do need to get 16" wheels for the 205/50/16 tire size. To my knowledge, www.tirerack.com has the most complete selection of tires online. They have customer survey data for most of the tires available to help you decide.
They have some 16" wheels available, but I am unsure of the quality of any brand other than BBS. Maybe someone with firsthand knowledge can give you some suggestions for reliable sources/brands of wheels.
They have some 16" wheels available, but I am unsure of the quality of any brand other than BBS. Maybe someone with firsthand knowledge can give you some suggestions for reliable sources/brands of wheels.