I can definitely recommend 356 20":
http://f10.5post.com/forums/showthread.php?t=510069
M sport 351 19" are not too bad either (I use them as a winter set).
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2004 e87 118d (ret.), 2007 e92 330d (ret.), 2007 e87 130i M-sport (ret.), 2009 e92 M3 (ret.), 2010 f10 535d M-sport (ret.), 2015 f10 M5 CP (ret.), 2017 f82 M4 CP (ret.)
2022 g26 i4 M50 & 2009 e70 X5 35d