I would end up on 195/50/15 - much better I gather... theres a bit of leeway on the width anyway I think. It might even be 215/45/15
Id probably go with silver, as if I do ever decide to go for a respray when Ive got a bit spare it will be dark, and silver will look better, and it looks good now anyway.
Hmm Im struggling over the colour now, this pic makes the anthracites look very nice: