this is my general opinion on a sorc.
Sorc's allow for classes with not much survivability ( in this case wizard ) a fighting chance.
by that i mean the CC and the DoTs. However, taking sorc as a main class may not provide as much satisfaction as it would a sub class for the main reason that it goes well with any class.
take the Ravager. Off tank, nice aoe, fair bit of dps. But, that alone wont be enough to go that extra mile. Then Bam. Add the sorc as a sub class and youll get a nice heal, CC AND DoTs.
so the ravager has just become a Dpsing off tank support that can heal. ( might be a little bit over exaggerating but you get the point )
so i honestly would say stick with the wizard as the main class and sub in the sorc for the survivability so you get all the perks and aoe's of the wizard and THEN the cc and heal from sorc.
i would say build SPD and HP, only due to the fact that you can get a decent amount of def from your equipment anyway and you shouldnt be in close quarters combat so having little EVA should not be a problem.
Hope this helped you to some degree
again this is only my opinion