My personal favorite is the Half Orc Barbarian dual wielding FotA (+5 when you get that horror! lol) and Defender of Easthaven. Also, if you can manage it, keep the Roranachs horn helm for him, don't make the superstick if you get around it... Give him Belt of Inertial Barrier (or a strength one if 19 isn't good enough sheesh!) to make him more resistant, and then bring a few different suits of armour along with you. Generally use Grandmaster's Armour (unless you have a thief with it and then you should use the firey +6 armour) or Human Leather. Both are pretty good for most purposes. Also, carry Shadow Dragon Scale and any other scale that he can wear (I think thats all of it though).
Basicly, you can take more hits than they can, since you have 40% resistance minimum in all types of damage.
Then, tack on the d12 and +5 hp from 19 constitution. Rage adds 4 more constitution and mostly makes belts less needed.
Oh, if you run HO barbarian, you can get 25 strength + constitution from Rage and Draw Upon Holy Might.
Monk is tough too. If you like cheese though, use the Kensai/thief. Really kinda cheap though.