[MENTION=29098]Rhun[/MENTION]: I'm generally a fan of metamagic feats for wizards. All my suggestions are made without looking at your spell list because I'm too lazy for that.
Assuming there are a good number of area effect fire spells, sculpt spell is a good choice.
If you want to focus even more on fire spells, Blistering Spell from PH2 is a decent option that adds a little debuffing to your capabilities.
Searing Spell would let you damage even fire-type creatures.
Consecrate Spell helps you damage fire-resistant mobs. Consecrate Spell isn't as good as energy substitution IMHO, energy substitution requires any other metamagic, which you don't have.
Enlarge Spell may be useful, depending on your spell list. OTOH, you'll have fireball in one level, and that's long range and awesome anyway.
I've seen Transdimentional Spell be a real lifesaver, but probably not until higher levels.
It's probably too early to take Empower Spell, too.
Spell Focus (Evocation) is probably going to be useful.
[MENTION=84167]HolyMan[/MENTION]: If you go to druid3/cleric1 you won't hit level 5 any later than anyone else in the party.