Heh, the first time I went through the game I had Erk, Canas and Lucius as a trio of 20-20 advanced class mages.
I like Raven, though he wasn't always greatly accurate with his attacks.
How good are your lords? When it comes right down to it, Lyn, Hector, Eliwood and Pent are the people you're going to really need in the end, though that doesn't mean that you should ignore the others.
Damn, now I really feel like playing FE7.