Having just read through the entire thread, I'm astounded that nobody has posted the only true Thomas yet - John Barrowman. Because for playing a guy that is so sexy everyone wants him, there's nobody else who has as much experience. And he can totally do suave as well as dolled-up in fairy wings:



For a bonus, here's him kissing James Marsters.
http://www.youtube.com/watch?v=o_0Tdq7F3LI

I'll be in my bunk.