awesome links redforever!
I also vote for Joshua Bell.
I randomly saw him playing on Conan a few years back when he released his "Romance of the Violin" album. My girlfriend at the time (who is now my wife) and I were mesermized when he was playing "O Mio Babbino Caro" (Puccini). It was such a beautiful performance that it has stayed in my mind forever. I actually sought out two performers to play it on harp and violin at our wedding!
http://www.youtube.com/watch?v=7CCSK57YN4k