I'm slightly worried that it's becoming trendy, but I haven't seen much proof and I agree that it sounds British.
I like
Simon for the same reasons you do. It's quite bookish, with a slightly melachony air to it. It's very down-to-earth as well.
Of yours I like:
Simon JamesSimon TheoSimon ErrolSimon Felix - my favorite.
Simon OscarSimon PericlesSimon RupertSimon Rufus
I like:
Simon Noble - my favorite
Simon Christopher (I have no idea, but I've suddely really started liking
Christopher.)
Simon RaphaelSimon Roy - just for the juxtaposition of the two names.
Simon is so British and upper-crust, while
Roy is so do decidely American working-class.