Weapon Damage > MND, after that the differences are pretty small, so get those 2 as high as you can and then you can concern yourself with secondary stats. Personally the majority of my gear has SS on it for the (slightly) faster casting/GCD time but good cases can be made for other stats.

Determination is certainly the most reliable, crit while not useless is a bit too random and we don't have any abilities that are directly affected by it like SCH's Adloquium or BRD's River of Blood.

Once you're full i90 you shouldn't need bonus points in VIT for any content. If you need the extra HP (for example if you're doing 3 stack fireballs on Twintania), then using melded accessories is technically better since you're swapping 3 MND for 8 VIT on each accessory rather than a straight 1 for 1 using bonus points.