Multi isn't all that important as Sv in pvp.
In PvE the current stat values are (from Azor's guide):
SV:
Code:
Agility 1.00
MainHandDps 0.94
AttackPower 0.90
Multistrike 0.52
Versatility 0.39
CriticalStrike 0.36
Mastery 0.25
Haste 0.24
Remember, those are the PvE values.
In PvP crit's bonus damage as well as the proc amount of Ms is halved, and so are their values.
Which means:
Vers (0.39) > Ms (0.26) >= Mastery (0.25) >= Haste (0.24) > Crit (0.17)
So, you want as much Versatility as possible, the other stats are equally "bad" nowadays. (Bad because their numbers are as low compared to Agi, so they won't make much of a difference).
Note though that dropping the 4p bonus isn't worth it. I simmed full gladi gear once with as much Vers as possible and once with only the chest exchanged so you keep the 4piece bonus.
The difference is ~100 dps.
The Set bonus can be averaged to 10.83333.....% more damage (depending on when you ES hit), which means +300 dps (ES did ~3.2k dps in the sim iirc).
Now, those sims weren't fully optimized, but give a general idea of how worthwhile the stats are.
TL;DR:
Go for Vers, avoid crit, everything else is ATM (meaning, as far as we currently know) pretty equal.
You don't need X% of any stat to be playable as Sv.