I know a few guys Ive met at H20 and Waterfest who run Raderwerks wheels and they look good and are good stuff overall. Raderwerks is also a distributor for other wheel companies such as Rotiform so some of their rims arent really theirs.
I actaully was looking into buying some from Raderwerks last spring and I called them a few times with questions. They were very easy to deal with and answered all of my questions. The nice thing is with Raderwerks, being that the specialize in VW/AUDI wheels, that the rims you get are going to fit without issues or any additional purchases.
With your drop the rims your looking at should fit no problem.