Any caster class would go well with a wizard
(even another wizard)
However if you are new I would not reccomend using
an Enchanter as they are difficult to play and
solo with.
The hardest thing about playing a Wizard, in my
opinion, is not overnuking targets and getting
their unwanted aggro.
-Necro and Druid would go well with a Wizard because
both can snare and/or root. If you do that the
Wizard can nuke all he wants and kite the mob if
so desired. Or the Necro can get the aggro and do
the same.
-Mage would be great with Wizard because the Mage's
pet can help tank and the Mage has nukes of his own.
A Mage's pet isn't the best when it comes to getting
and holding aggro, but its better than nothing.