The main stats like dex, vit, str etc.. Just hold your mouse over them in the character window and you'll see precisely how much they give you.
From my personal mathclub i've calculated that atk speed is somewhere between 2-3 times better than crit damage. Meaning a 15% atk speed ring will be better than a 30% crit dmg, but 50% crit dmg will be better than 20% atk speed.
This is purely raw dps though, it all depends on your playstyle what you benefit from the most. Do you play with a tank? Slow huge hitting missiles = the win, or do you kite everything, then atk speed wil win when you can get a few extra shots off every kitestop.
Well you didn't take into account how crit damage is highly dependent upon your critical hit chance. If you start to massively stack critical hit chance, and get up to say 50-60% critical hit chance, then critical hit damage becomes a complete monster in terms of damage. And this is useful because on an amulet you can get up to 65% critical hit damage, while attack speed is capped at 17%, so you actually get way more of an increase from criticals
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