I've seen all of the Murphy's lectures.
I liked John Archer's magic that could be performed on stage. You learn a few cold pieces of mentalism as well as a balloon sword swallow.
Paul Draper: There's more mentalism here for large groups. There isn't a ton on this lecture but I have applied a few of the principles he goes over to my performing repertoire.
Jason England: You will learn some solid card magic here. Triumph, twisting the aces and the fingerprint trick. There's a bunch of gambling style routines taught as well.
Alex Pandrea's: If you wan't close up magic then this is great. You learn a bill switch as well as a handful of fun card moves.
Dan Hauss: If you want to see a crazy hodge podge of close up magic than this is great. You learn his version of sleeping queens as well as his effect rubber thru hand.
Rich Ferguson: Rich gives a great run down of what it is to be a professional. He goes through some great effects, some better explained than others, as well as some solid professional advice.
Those are probably my top 5 Murphy's lectures based on my personal tastes. Also, I have applied and used a piece of magic from almost each of these lectures listed. Ask me about any you'd be interested in.