gestalt character

[DEMON]

[*]Fighter: Eh. There aren't enough good feats in core for the bonus feats to be worth anything, so all this really gives you is full BAB.

Well since ACFs are a go, there's always Dungeoncrasher and Hit-And Run Tactics. Plus it would grant you access to some otherways inaccessible feats (Weapon Mastery and Improved Critical come to mind).

Combines better with a Druid, than a Cleric, though, in my book.

I'd probably go Cleric//Wildshape Ranger, methinks. Or, if you want to steer clear of the existing characters, Druid//Monk and Ranger//Wizard would both be nice.

All solid options. The Ranger//Wizard is basically the concept of Mystra's Shooting Star on steroids.