Light armor build in PvE worthwhile?

djkms1

So im a level 19 wizard right now and trying to decide the best route to go for my build. Like a dummy I jumped in head first without looking and started to stat DEX and CON here and there not really knowing what I was doing. I know at some point I will have to restat due to my point distribution. i would like to restat now so it will be as cheap as possible for me.

I do play 90% of the time with my roommate who is a 19 Blademaster.
He doesn't care how much damage I do we just play to have fun and squad together.
When we play we take on our own mobs most of the time (maybe this will change once we get to higher levels as I am noticing that I am having a harder time solo'n mobs the higher i get)

I like to do the occasional PvP in town for kicks and the challenge.

So I guess here are my questions:

1: If I go a pure build will I pull aggro off of the blademaster often, risking death for myself?
2: Will I have this same issue with Common build?
3: How much of this game is party dependent? Is it just the FB quests or do parties of more then 2 become more required the higher you get?
4: How badly am I gimping my party by going light armor build?
5: In a full party scenario can I spam my spells as much being a pure build as a light armor build without pulling aggro? I know this is probably dependent on how good the tank is but I would like to spam if possible
6: Light Armor build endgame. Same as question 5. I would prefer to spam 8-10 spells in a fight as apposed to 3-4 bigger numbers.

Spamability makes me feel more involved in the game :P

Thanks for your help!