Maybe you could tell us what you have now (not that 'crap' isn't descriptive) and we can fill in the blanks.
The general rule with wizards is to prevent yourself from being hit altogether, so use things that provide a miss chance...mirror image, blur, displacement, invis, blink, (darkness), clouds. Things that absorb damage, like energy resist or stoneskin and things that raise your hitpoints like false life, bear's endurance along with spells that help your saves, like heroism or resistance items. Things that up your AC, like natural armor items, shield, mage armor, protection items...but if you are trying to avoid getting hit by upping your AC, you are already too close for comfort IME.
Did I cover everything?