Just looked at Tire Rack to see what tire options there are for the 19s when it's time to replace. I REALLY like the Conti Extreme Contact DWS I've got on my 335d. Turns out there are very few tire options in the 235/40-19 size, including no Conti Extreme. Is this an odd size? Should I get the 18s so I have more tire options? I don't like the dark wheels with the MSM paint I selected.