Go to
http://www.project1999.org/forums/sh...ad.php?t=80165 and you will get a idea who is good at your questions. Lot of interesting reading. But yeah Enchanter, Necro, Shaman probably in that order are up there.
Loraen, Tecmos, Catherin all Enchanters, have done some pretty scary stuff solo. Not counting other Enchanters. So they are tops indoor for sure. Duo wise Enchanter Shaman have a lot of the same spells. Cleric brings better heals with CH. Better HP buffs for the Enchanter and pet. As good of Root as a Shaman. But I don't see how you could go wrong with either with a Chanter. But with a Necro I would want the Shaman.
Sk, Cleric might be better than you think indoors, but not my first pick, but could get the job done on all but the really hardest mobs.