I needed this info myself the other day (now i know i just miss 3 points and not more, with my +10, +11, +12 dark robe set) And i better could have waited till the lvl 55 set to make the crafting max. A well 1 more level to go 
The kind of bonus an equipment can get differ from one type to another.
Sword
strength = 30%
intelligence = 5%
dexterity = 30%
wisdom = 5%
vitality = 30%
Axe
strength = 35%
intelligence = 5%
dexterity = 25%
wisdom = 5%
vitality = 30%
Mace
strength = 30%
intelligence = 5%
dexterity = 25%
wisdom = 5%
vitality = 35%
Dagger
strength = 25%
intelligence = 5%
dexterity = 40%
wisdom = 5%
vitality = 25%
Bow
strength = 30%
intelligence = 5%
dexterity = 30%
wisdom = 5%
vitality = 30%
Gun
strength = 30%
intelligence = 5%
dexterity = 30%
wisdom = 5%
vitality = 30%
Staff
strength = 1%
intelligence = 39%
dexterity = 1%
wisdom = 34%
vitality = 25%
Robe
strength = 2%
intelligence = 41%
dexterity = 2%
wisdom = 35%
vitality = 20%
Light Armor
strength = 27%
intelligence = 3%
dexterity = 35%
wisdom = 2%
vitality = 33%
Heavy Armor
strength = 33%
intelligence = 2%
dexterity = 23%
wisdom = 2%
vitality = 40%
And the range of bonus that can be gained differ from level to level.
level = 1 - 30
range = 1 - 6
level = 31 - 50
range = 4 - 12
level = 51 - 80
range = 8 - 18
level = 81 - 110
range = 12 - 24
level = 111 - 150
range = 16 - 30
