Shaman was hands down my favorite duo partner as an SK, so if it's only between shaman or enchanter I'd personally go shaman.
Druids and clerics are options too, but those shaman slows will be awesome in situations where the SK can't fear kite, such as tight dungeons.
Enchanters are very potent but as Exmo said don't necessarily compliment an SK, so he might see more downtime as opposed to pairing with a healer. Crack won't make a huge difference to lifetap regen.
No matter which you pick you'll have 2 classes that are easy to flesh out a full group with though, so just do what you'll enjoy most.
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