The 135 is one of the few BMWs I'd still buy, Z4 is the other. My '08 vert had a few problems because it was one of the 1st ones made but it was a great car to drive. I doubt if there are any problems with rattles or anything else now and you can get the DCT which is a great transmission. The 135 can get expensive quick if you add a lot of options.

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1980 633csi (Retired 1985)
2005 325i (Retired)
2006 Z4 3.0si (Retired)
2008 135i vert (Retired)
2009 328i vert (Retired)
2011 335is (Retired)
2011 Z4 3.0 (Retired)
2012 328i Coupe
2013 M3 Coupe (Retired)
2013 650i Coupe