This place is dead! Go over to E60 Forums. I think it is
http://5sweries.net and then go to the forum section. Great Site! In regards to your question, I had the M5 OEM 166's on my 545i and thought they looked great! They do not look small at all. They compliment the car nicely. Go over to the E60 Site and search. You see a ton of pictures from members rides with the M5 wheels on them. Another alternative if you plan on staying with OEM wheels would be the M6 Wheels. Same size, but a lot more aggressive.