I went through a tire sizing dilema with these same wheel sizes. See my signature for what I ended up running with. I love PSS but I wish 295/35 or 305/35 was available for the 11" wheel. Other options include Hankook RS3's (265 / 285 (nothing larger than 285 available), Nitto NT05 (275/35, 295/35) or Michelin PS2's (275 or 265 front, 295/35 rear).
'13 SSII M3 Coupe - KW Clubsport 3-way (Eibach Front Spring Conversion), Akrapovic Evolution, ESS Tune, StopTech Trophy, IND Euro Front Bumper and Gloss Black Mirror Covers, TMS Studs/Lugs, BMW Performance Carbon Fiber Spoiler/Interior Trim/Center Console, BMW Edition Grills/Gills, BMWPedals Extended DCT Paddles, Mode Carbon GT4 Splitter, Advan TC3 (18x9.5/10.5), BBS E05 (18x10/11), G-Force Rivals (275/35/18, 295/35/18)