When I mounted my new satin black Apex wheels, I went with a set of these RS-Technik TPMS with valve stems in Black because didn't want to have stock aluminum/silver color messing up the look. System sync'd right up with stock BMW with no issues and I am extremely happy with the look. Even got a great 'first buyer' price, link is below, full set of 4 runs from $180-200 depending on model. BMW price is about $75 per wheel, so about 1/2 price of stock.
http://www.pyspeed.com/RS-Technik-Wh...ries-s/795.htm