Lots of magic item spoilers to follow.
I'm near the end of a party run with a Cavalier, Imoen (6t/9m, all points into set traps and detect invisibility), Minsk, Dynaheir, Coron (also uber deadly), and probably the most powerful of them all: Yeslick.
Geared up with the "cursed" Big-Fisted Belt, strength climbs from 15 to a 19 and the intelligence drops from 7 to 6. You can still equip wands if you burn a potion every level gain, and you don't need to remove the belt ever. Other keys items are: The Brawling Hands, Ring of Sune, Senses of the Cat, Eventar's Gift, Amulet of Spell Warding, Full Plate, Helm of Balduran, and The Spirit's Shield.
With a 16 wisdom he can cast Protection from Evil and Draw Upon Holy Might 6 times a day. When so buffed, he's nearly unstoppable. Oh, and I took two-weapon style x2 so at level 7/8 thats 3 apr of blunt force trauma.
103 hp. Death save 0 Evil Spell save 1
Str21 dex 20 con 19
Ac-8 vs evil,, missile -8 slash -4 piercing -3
Damage is 15-18x2 and 13-16 offhand with speed factors nice and low.