If could pick one guitarist to meet that is still alive, I think Jimmy Page would be one of the main candidates.  He joined the guys from The Black Crowes on stage in England for a rendition of "Shake Your Money Maker".

I think everyone can agree that when big time musicians join other musicians on stage it is an awesome thing. Jimmy Page and The Black Crowes have worked together before on the Live at The Greek album from 2000. While the Crowes were playing a show over in England Jimmy joined them onstage for a song. Page has still got it. Every time I see Jimmy Page play it just makes me long fora Zeppelin reunion that will never happen (thanks a lot Robert Plant).