Because the game has only been out for a little while, there aren't any perfected builds yet. Everyone has their own preferences and what works for them, so a lot of it will come down to how you want to play your character: damage dealer, support, healer, or hybrid.
For stats, avoid INT until they redo the stat values as the benefit is minimal. CON and WIS are the best and it comes down to, again, how you want to play your character. I prefer full CON for more tankiness, more buffer while AoEing, and I have lag issues so it has saved me a lot, lol. You get 18 hp per point and some hp recovery so it really adds up when you keep putting more into it. I had a good 700+ hp on people who did not invest into HP.
As for WIS, this will come down to 3 things, if you are a healer, if you PvP, or if you use the magic buff on the left side of the tree that drains mana/sec. If you a healer, the extra mana and regen is a necessity when using a lot of heals in succession. If you PvP, the extra WIS can come in handy if you get hit with mana drain spells. And if you get the buff, the extra regen can counter some of the mana drain making it easier to use other spells.