[s-cars] Wheel dilemma

[Tony Curran]

Hi folks,
 
I am attempting to purchase new wheels and tires for my S6. So what's the
dilemma.
 
1. Want to use OE or replica wheels. I want to stay away from centering
rings due a lesson learned with my Jaguar XJ8 (new bearings per wheel is not
cheap on these cars). 17x8 replica wheels are hard to come by (as well as
being astatically pleasing).
 
2. I am about to install 993 calipers so need the x-factor spacing.
 
3. I'm cheap - want to do this for $200 (cdn) per wheel.
 
4. I'm cheap - about $100 (us) per tire. 243 or 235 /40/17 tires don't fit
on 7.5 inch wheels - according to manufacturer spec sheets.
 
So the questions are:
 
Why do 45% aspect ratio fit on a 7.5 inch wheel but 40% don't (for tires in
price range, looking a Sumimoto HTRs II and III)
 
Can someone point me reasonably price replica 17x8 OE wheels.
 
or should I just go with 18x8.
 
TIA
 
Tony
96 S6 - still with the winter tires on