You'll be a great tank, but you'll probably let a lot of people down who need help due to a poor mana pool.
As someone who has played many healers you'll want to do elf/d-elf or wood-elf. Then I'd go with the half-drow and half-elf. I put svirfs and gnomes in the third tier. Their stats are pretty good and the mana pool is decent especially with converted practices, but they seem to get beat up the most due to all the pounding attacks on mobs. Arials are decent, but I found an arial healer harder to gear for "how I like to play my healers". Then at the bottom I'd put storms, clouds, and dwarfs.....all you do is sleep.
