As much as possible.

However, a lot of gear this tier are CRIT/PIE so if you feel like you won't need that extra piety cause you're okay with mana, just take one of those det/sps gear.
For melding, cap crit on every pieces on which it's possible, then go for det or direct hit.

Just remember that to make direct hit be worth melding, you need to be activately dpsing cause compare to det it's only something like 0,8% more damage while losing 10% healing (at high values).
You should be able to reach something around 2200 crit.