Best Box Sets?

I'm looking to buy some new music and thought box sets would be a nice place to start. I listen to all kinds of music so I'm looking for recommendations on well done box sets for various artists, musical genres, and periods. Preferably ones that have been remastered or come from the original master tapes.

For instance, I was at Best Buy today and was going to buy a Motown boxset, Martin Scorsecse presents "The Blues" and Rolling Stones Box Sets but then I figured let me ask around first.

Thanks,