Tom you may want to look for the 16" CLK wheels I use on my 124/123 for autocross (look at some of the ax pics i posted in other threads), unfortunatly theyre too small for my current car, the SEC so I'm going to be going to a set of 245/17's in front and 275/17 in rear.
You should come to tri-o-rama in NJ this year for the autocross, I'll be there and we can run against each other