That is a great combo for Warriors who want to have SOME constant healing, Druids, Priests, and maybe rogues for some of the higher end ones. Mages are tricky. You need the buff pots for Intel, mana, regen, armor... all well needed especialy in the lower levels. However, there is a trick to mining and engineering, though this is far better on a priest. you can make your own headgear that adds +intel, some of it availible at level 10 (tiger lense goggles I think), if your skill is at 100. Various items can really debuff a problem mob, take aggro from you, and really be helpful for some non-mana explosions.
Each of them is an EXCELLENT choice, hands down. It just depends on your playing style ultimately. Buffs or debuffs/booms.