I'm playing a dwarven Fighter/Thief currently and have now nearly finished SoA. From the beginning I have used Mazzy, Korgan and Edwin. My PC and Korgan serve as main tanks while I use Mazzy as a sniper. I'm the type of guy that likes to run into a room and start hacking everything into chunks and if that's the kind of tank you need you can't go wrong with korgan.
Reputation is a bit of a problem with the evil folks ofcourse but it's not too hard to keep it at 18. What I did was get the silver pantaloons as ransom for -2 reputation and also hire Viconia then chunk her for another -2 rep.
After the asylum you can slayer change fot -1 rep when you need to so it's no longer a problem.
As said before Hear Dalis is good too, but he needs a bit more micro-managing and is very weak at the start so be sure to quickly get the fortitude girlde and green ioun stone for him.
As you might have noticed I use no druids or clerics at all. This is sometimes a bit harder but I can reduce party size this way as I see clerics as nearly useless. I use rings of regeneration and Gaxx as healing as well as some once per day items. That way I don't need to take any whiners along.
Concluding, I'd recommend:
PC
Korgan/Hear'Dalis
Imoen/Edwin
?
