read this:
okay I tell you what dex gives (and I don't look at any page or something for that. I've got it in my mind)
blows sucess, dmg = no need
shield defense rate = no need
evasion = low need, cause you wear a heavy armor and got a lot of p def
run speed = low need, because you have dash + range skills
atack speed = need, BUT since atack speed doesnt influence the reuse time any more it's not that important
str:
P atck = strong need
disarm + stun succes = strong need
Con:
HP = strong need
stun resis = need (not that much cause you have lionheart + war frenzy)
if you have a healer on your site who concentrates on you go str+ dex+ con-
if not is str > con > dex.