T1: +1 Wis Skills Wiz 6,
T2: +2 Wis Skills Spell Power
T2 Bonus: Aspect of Earth: Summon Dense Stone Earth Elemental (2/rest)

T3: +3 Wis Skills, Greater Spell Power
T3 Bonus: Earth Earthgrab Guard (chance to immobilize)?

qns:

+1+2+3= 6 wis skills does it stack with the +6 wis neck i already have?
wiz 6 do not stack with current wiz items?

any other better advice than this?