What's best for tanking, healing, and what classes re the high DPS classes now?
It's a really bad idea to choose a class based on how things are at the beginning of an expansion cycle/from beta test numbers. There will be rebalancing, bug fixing and often complete reworking within the first couple months. Design philosophies will be overhauled or abandoned(lolTriageHealing).
Perhaps if you tell us what you liked about classes you played before, we might be able to help find something that fits what you're seeking. But basing decisions on hard numbers during a time where the mechanical build has always proven to be incomplete is likely folly.