At endgame your stat priority is going to be the following:
Strength
Accuracy to 110% (100% displayed for melee strike, 110 for special skills)
Crit to 30%
Surge to 75%
Power to infinity
As your gear improves through the tier levels you will begin itemizing more and more towards stacking power - once your crit is where it needs to be power will begin benefiting you more than strength as you no longer need the extra crit from your mainstat. (meaning eventually Power augments wil benefit you the most, NOT mainstat augments)
(1 strength = .2 dmg and .008 crit chance, 1 power = .23 dmg)
Endurance is incidental and your hp will rise as you gear up - NEVER choose endurance over any of these dps stats.
You can use this as a guideline as you level - you won't achieve the same numbers but you can use it to attempt to balance your stats.
Also this is for Annihilation spec, the others are a bit different.
Hope this helps!