I'm not quite convinced about the whole crit > hit thing, actually let me elaborate.
+8 crit rating = +8 hit rating in item level points
+8 crit rating = ~.36% crit
+8 hit rating = ~.51% hit
using shamulator I recreated my character(along with his approximate attack power while buffed)
I then ran the simulator comparing hit to crit, with the stepping for crit equal to .36% crit, and the stepping for hit equal to .51% hit and using my current values as a base, that way I could compare each fairly and heres what I came up with:
lets take a look shall we:
1rst row, 4rth column(the effects of keeping my crit the same and adding 3 x +8 hit gems): 1168.7 dps
1rst column, 4rth row(the effects of keeping my hit the same and adding 3 x +8 crit gems): 1166.7 dps
that difference is so small I wouldn't notice either way.
Also notice I ran this with 5000 swings per cell(instead of the default 1000) so this should be accurate.