RS4 DTM wheels (?)

I own a silver 2001 Audi A6 2.8 fwd (picture to come later). It came with 16'' stock wheels, and I want to upgrade it to 18'' RS4 DTM wheels. I did some searching and found these two replica wheels: one from hartmann and the other from lakeshorewheels.
http://www.hartmannwheels.com/site/audi.php
(RS4 DTM)
http://www.lakeshorewheelandtire.com/specials/audi.shtml#18inch
(S-Concept SO1)
Hartmann wheels were pricy ($260 per piece), and actually want to get new/used tires mounted on the wheels before buying to reduce total cost.
Do any of you guys have experience with these RS4 DTM replica wheels or have any suggestion on where to buy them (+costs) and if my car would have any problem with breaking/steering/weight issues with the 18'' wheel? Also, if I what is the average cost of mounting tires and aligning wheels respectively?
Thanks!
I wouldn't think you'll have 'problems' with braking, steering, weight, but there will be a difference in weight, so might be a little harder on brakse, a little less acceleration etc.
But a lower profile tire on a larger rim will also change your steering a bit - the shorter sidewall (depending on the tire you choose) should provide better steering response.
Will you be lowering the car with coilover suspension to reduce wheel gap?
I looked at H&R and Koni coilovers, but do you have any recommendation for good/not-too-expensive coilver suspension? Also, do you still have your stock S4 wheels?
Thanks!




