A trick I saw recently is to get an item with no stats (ie, "socketed ring") and one with +1 dex. Then you can equip the one with no stat and hover the item with +1 dex to see the approximate value of 1 dex in terms of dps given the rest of your gear.
A good slot to do this with would be a slot which doesn't have any +dmg or +ias, such as bracer or shoulder.
e: hate act 2. The latter half of Act 3 is so much better in terms of farming / danger. Just have to watch out for phasebeast packs.
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