If a certain well-respected rock musician takes the time to answer your email and ends it by saying he'll get back to you, do you bother him with another reply saying 'thank you' or do you just wait til he gets back to you?
I would thank him for taking the trouble to reply to your email and look forward to hearing from him again.
Good manners cost nothing - which is why I never get replies to my emails ;-)
Oh I saw your email there Jeffrey about the HR cds :D
Sure email him back, and say
"Thank You Oh Brian. Master of The Universe. I will always adore your giant head in the middle of the stars in Star Fleet, and pray to the altar of your patentised wigs and air guitar cds. Amen."
Hey! With this perhaps you might get a free air guitar cd :P
I'm actually quite embarrassed about the whole thing. I was very tired and don't think it came out too well, and I left out stuff and just generally wish I hadn't written :-P