Which remasters to pickup?

Ive got a few old cds that that have since been remastered. I want to know which ones are worth picking up.

Sly and the Family Stone-Anthology Remastered
Cream-Remasters
Led Zeppelin-Remasters
Santana-Remasters
Al Green-Remasters
Isaac Hayes-Remasters (import)

I dont have an SACD player yet, but Ive got a few hybrid sacds that sound pretty good. The Rolling Stones are the best Ive heard so far, the Police are okay, and Im anxiously awaiting the new Pink Floyd DSOTM disc. Also feel free to recommend anything in the soul/old r&b/classic rock genres.