I echo the sentiment of "Get
Tome of Battle on the allowed sources list if you can." In this case, a LN Human Cloistered Cleric of Mystra3/Church Inquisitor1/Crusader1/Ruby Knight Vindicator5/Contemplative3/Ruby Knight Vindicator+5/Cloistered Cleric+2 seems to get you want you want.
-You can tank through Crusader maneuvers and the Crusader stance Thicket of Blades.
-You can cast and persist spiffy Cleric buffs. You can cast spiffy heals and
plane shifts. With Initiate of Mystra, you can even cast these spells in a no-magic zone!
-If you feel like it (and your GM allows
Unapproachable East), you can go
Hood to some degree.
That is the best "Fighter" archetype there is, because she's fast, damaging, long-reaching, and versatile.