Back when I did the math for my resto druid on whether to farm for mainhand + offhand 217s socketed vs keeping my artifact, the artifact came out ahead. The 40-50 ilvl difference means that while you gain an extra 100 versatility you lose about 150 or so mainstat, a not insignificant chunk of stamina, and some other secondary stats that are inherently higher on the higher ilvl artifact. The gain in +heal and dmg reduction wasn't something that I felt outweighed the loss in dps and health pool.
Now, if you have access to the garrosh heirlooms (2 sockets per 1 hander) then it's a different story. A total of 4 sockets dualwielding those will definitely be worth it, but 2 sockets from dungeon 217s are not enough imho.
Of course, that's from the point of view of WPvP, and a resto dpser. For me, versa is about tied with intellect for dmg increase. If it's e.g. twice as good as agility for DHs then by all means go ahead.