As has been mentioned, don't be surprised if you simply fail at heroics due to pets not being able to tank as well as real tanks. There ARE people who tank heroics with their pets but don't expect to be able to gear yourself up in purplez fast with that group.
http://www.warcrafthuntersunion.com/...nking-heroics/
With that in mind, I would personally prefer a shaman or druid for healing duties. Druid for now, though after Cataclysm I might change my opinion to Shammies with the buffs they're getting. Druid is a better pure healer, IMO, but a shaman brings more group buffs and wipe prevention to the table.
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