wag, same dilemna here with our 550 and aero kit like yours, when due i think m5 wheels will look best, the e39 looks odd, the csl's i doubt will look bitchen on the e60 and the m6 are just a hit and miss thing, youd have to actually see them on yer car. e60 m5's are best imo!

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2008 E82 135is JB2 Alpine White / Lemon
2008 E90 335i JB2 Monaco Blue/Grey
2007 E85 M Roadster Black/Black
2006 E60 550 w/ M Kit Silver/Black
2003 E46 M3 SMG w/ VMR V715 19's Blue/Black