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IM the 545 because it's a 5 spoke. I think it looks cleaner. vo7848 is right, if you are going to drop some bread and buy these wheels, save some more and get the R series.
The flat lip IMO has a more exotic appeal. Not only does it give the appearance of a deeper/wider rim, it looks pretty sexy when it's spinning down the highway. BTW, I own a set of 547R's.