Hmmm...I always have two tanks, be they Minsc and my PC or Minsc and Keldorn or Mazzy and...you get the drift
I always have one character dual-wielding and the other using (in the case of Minsc and Keldorn) a two-handed sword or sword and shield (only Mazzy [img]tongue.gif[/img] ).
I usually play a ranger so she always dual-wields. I suggest katanas and scimitars if you're not adding any mods because hindo's doom and specral brand are very nice together