I have had this exact setup, I have 19" wheels (stock bumpstops) for over 3 years and am very happy with it. Not sure exactly what the deal is with shorter bumpstops, but now I am interested.
2008 Monaco Blue/Tan interior 335i sedan. Mods: AFE intake w/ scoops, AFE Exhaust, ER FMIC, Koni FSD/Eibcach Pro-Kit, Breyton Race GTS wheels w/ Continental ExtremeContact DW tires, Cusco OS strut bar. BavAuto Black/Beige seat covers w/ black floor mats, M3 rep trunk lip, eBay front splitters.