Lots of builders do 'em, Dazza at Llewellyn would be my personal pick for "best", with a close second to Vanilla.

http://www.llewellynbikes.com

I personally won't touch them, not worth the effort in my opinion. You can get the frame chromed for the same price I'd charge to polish, which I personally prefer anyways.

A well polished BB shell especially is a sign of a very competent, patient builder.