Hmm, well I try to vary it a bit but I rather like this class group:
Paladin, Fighter, Blue Mage, Summoner
I got Fitzhugh and Tania, for Initial strike and Haste to the party.
Archers are really good for random encounters.
If you have the money for it, Assassins can be really nice. I tend to stay away from abusing $Toss though. They're also nice for big groups too.
I actually like having a Bard/Dancer around, especially for the beginning areas. I'd definitely learn their Sing ability at least.