I always go with the 2 armors..
The Heavy armors in this game are not that good.
almost all the top gear yu will get along the way is Mediun or SpellBased dudes.
(Like the amazing gear for thunder yu can get in Iron Forge next to Shar statue..)
so i always get those 2 becouse its really strong as F. early and i will almost all the times only change the heavy for Thorn dude one act 2.
then Raph in act 3.
so thats it for heavy good in this game.
BTW yu can get in good boy runs the armor from the metals in Karlach quest in act 2 really good heavy gear too..

And the Mid one.. always go switching untill i find the top ones for the characters i use..haha
end game always endup in Jaheira or Minsc something like that..xD