Have you explored the wiki and strategy page? I encourage the peruse those because as you look you'll discover many things important you didn't think to ask.
http://forum.shrapnelgames.com/showthread.php?t=38122
http://dom3.servegame.com/wiki/Super_combatant
SC gear caveat... depends what you'll be fighting..
Some of the best bang for the buck..
amulet of luck
amulet of anti magic
starshine skullcap (+2 mr even if not astral)
frostbrand
shield (Charcoal or vine)
boot of quickness
rainbow armor
add more reinvig if casting pre-combat
-ssj