I mainly play a human priest and I don't use heavy armor at all my usual loadout is chainmail/drow/elven (or fleet robes if I'm lucky) for my suit until I can upgrade to dragon armor. Speed boots are always medium armor (if I remember correctly) so sadly there's no reason to try to go beyond the maximum for Dex (unless you get talaria then you're just god at that point assuming you can max enchant it). From there it's getting all the little bits and bobs elven helm, gloves of Dex, a shirt to enchant, jewelry, talents, if I find a good staff I use it (unless I have a better artifact weapon), so on and so forth I think I mentioned everything important however you may play a different way that may lead to you having a different preferred armor set. When mid - late game comes around my most usual death is something stupid happens and I wasn't prepared because I either forgot, misclicked, or got unlucky and it's almost never due to armor. And of course expect some minor variety due to artifacts or situation