Congrats on your purchase. My roadster came with the al season tires so I bought aftermarket rims with mich ps2's. The staggered 18, 19 size was a bit hard to find. I have TSW Kayalami's and they look great. The whole point being that I am planning on keeping the car a while and I will have the original rims in perfect condition, no fretting about the un expected curb rash. The TSW's were less than $300 each with tpm's. Having the original rims, scratch free, on the car years from now will be worth a lot more.
Btw, I'd like to see a pic of your SL if you post any.

Noel
black SRT6 roadster