I prefer vit over agi (my previous stat was like this : Int 400 vit 135 dex 260 agi 350 gr 100
Although this build got ultra high evasion .. I can't solo bosses that has a lot of stun like ouvel ..so I scrapped this build and went for
Int 400
Vit 335
Dex 350
Gr 100
BL 100
Using 4 green line and a shelk have decent Eva cause of quick turn and makibishi (600 base , 850 with qt and maki)
While my HP is around 35k allowing me the use of resist set which boosts my survivality further -- easy farm ouvel ftw
(I'm not a full DMG build though ..although I do got 9k matk unbuffed using tellas without using any 2s..except free spec or Al like ouvel)
But I won't say this is the best build for the class (but its the best for me)
Only nemesis is HP 1 and burn(followed by either buff wipe or stun ..resist useless if u only got 1 HP left xD)
Back to topic
200 dex is indeed enough but if ur after a longer duration for spellboost adding more is recommended
Agi is good to increase raw matk cause ull be able to use magic amp and hicolons which gives a really good chunk from agi (hicolon gives a fix 2 matk per agi if u don't really build for spellburst)