Wilkesy2

I am looking into buying some S5 rep wheels for my 2011 A4 meteor P+ sport package. I would also like to find some in 18s....not great roads in MN and want to put my stock 245/40/18 tires on them. I really do like the Hartmann S5 reps but they don't make an 18. Does anyone know where I can get my hands on some? I saw that someone got some from RimAlloy Canada for a great price. Does anyone know about the quality of their product or could recommend another reputable place (in the U.S.) that I can get some from? Also, what offset is best (stock 45 or something like a 35)? Thanks for any help.