You want the best combination of high min/max with ias that you can afford.
Slow weapons are not necessarily better. Remember the bonus that Blind gives and that your ability to drop an additional bell during cooldown relies on how fast you attack.
EDIT: Also note that Nrvana disregards the "damage per spirit" issue and turns it into a Bell dps issue.
Slower weapons are cheaper for the same DPS and get a bigger DPS boost from EF.
However if you intend to add a Marquis ruby to MH which you should for Nirvana WoL then faster ends up with more DPS!
With a weapon with x APS d +damage% and EF with +a APS
DPS' = (DPS / x + 160 * (1+d)) * (x+a)
With DPS=1100 x=1.2 d=40 a=.25
DPS' = (1100 / 1.2 + 160 * 1.4) * 1.45 = 1654
With DPS=1100 x=1.4 d=40 a=.25
DPS' = (1100 / 1.4 + 160 * 1.4) * 1.65 = 1666 (12 more DPS with faster weapon)
A faster weapon with a Marquis ruby will get a bigger boost from EF except in an extreme case of DPS=1400 and d=30%
Hope this helps. Fitz nailed it with a really fast weapon.
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