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You can still connect using USB, but by the time you've changed around your connections you might as well use the ethernet. The existing connection setups will efectively be redundant.
Recommendations for routers are in this article:
http://www.cableforum.co.uk/board/article.php?a=74
Regarding most wireless capable routers, they also have wired ports. Thus you cna have wired and wireless on the same network. Only thing I have found is, if you are sharing files / printers on the network, you must choose the right network mode on the router - linksys refer to infrastructure or ad-hoc, I think it's infrastructure you need - perhaps a case of RTFM before plugging it all in.