Sounds like a good spec to me. Silver's a good choice - darker colours definitely get dirty quicker.
Did you test drive the manual 335i, and how was it? Presumably pretty good if you decided to order one :-)
Which wheels are you getting? As you can see from my sig, I went for the 18's but they don't feel much different at all from the 19's on the demo car.
2012 F10 520d M-Sport, Sport Auto, Imperial Blue, Black Dakota, Sun Prot Glass. V-spoke 281 Winter wheel package
Previous BMWs: 2009 E92 320d M-Sport, 2006 E92 335d SE, 2004 E60 530d ASE, 2000 E39 525d SE, 1997 E39 523i SE