My wheel obsession has led me all over (kinda krazy kuz I havn't purchased my ssR yet! but I fill the void how I can...)Colorado Custom is the only company I have found that has 19 and 20 sizes with lots of choices- even retro and classic. They seem reasonably priced.
Another answer to the question may be 20 and 20. Centerline wheels offers the California series 20" at 159$. They would need to be modified to the proper width and offset. Pistons #1 fan posted a website for Weldcraft Wheel. They will widen a 20" wheel for 200$. This combo is cheaper than most Wheels I have priced.
The tires I found for this combo are Goodyear Eagle HP ultraplus at Tirerack.com. 255/35/zr20's are 149$- 295/40/yr20's are 170$. The treadwear rating is higher than the stock RSA's but the ride,noise and snow performance suffer some.
One advantage for me would be mothballing the custom package in the winter for the easier to clean rims and better in the snow tires.
hmm...
hmm...
