ok it's 4 in the morning here, spoilered for length and ..... madness
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[spoiler]I second Cleric//Druid but I would take planar shepherd if it's available
(planning domain for extend spell and undeath domain for extra turning)
or pick two of the elemental domains; (air, fire, water, earth) and initiate of nature(if your DM will let you use non-undead turning attempts cheese) this will be something like (3+ CHA mod) x 4 + 16 turning attempts w/extra turning, add 16 for each additional extra turning
or
Bard1,Warblade19//Archivist X(whatever turning PrC), take white raven tactics so your warblade(or crusader)levels stack w/bard for inspire courage + dark knowledge + buffs
Factotum///Archivist tons of skill points + dark knowledge + most spells + FOI abuse.. (also DMM abuse if you can get turning)
was going to squeeze spelldancer in this last one, but you'd have to
1. get a 3.0 class approved and
2. light 4 feats on fire and
3. once you did all of that you would end up w/something like
archivist4,spelldancer1,archivist15///factotum1,fighter2(or monk2 cobra strike fighting style),binder1(bind naberius to heal the con damage while dancing for unlimited metamagic every morning while casting buffs),factotum X
MAD and after all those feats you don't really have room for much metamagic until level6, BUT that is a LOT of metamagic ..... once you can get the feats
EDIT: Actually might work better with cleric(the domains can free up some feats) , but then you need perform...
Cleric4,spelldancer1,Cleric15///Bard1,fighter2(or cobra strike monk2),Binder1, Bard16 now you buff every1 in the morning with all the metamagic you want then just hang out and
play music the rest of the day 
ugh... pick one: (moonwalk, robot, break dance, jerk) the rest of the day
[/spoiler]
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actually it would help if you could tell us what the other party members are playing or just their assigned roles and how many players, it's easy to step on toes in Gestalt
Also, do you just need something decent, or something VERY POWERFUL!?!
