If you dont want to rely on luck you can always make a "rhyme" grim shield, itll have nice defense, block, block some resists and the all important, cannot be frozen. If youre a little more wealthy you can also make the sanctuary runeword.
If youre very offensively minded and have a decent amount of +lightning skills AND are quite wealthy you can also go for a dream runeword shield which will give you a holy shock aura that synergizes with your lightning mastery.
All these suggestions only really apply to expansion though. Is you are playing on classic then be like metmop and gamble/trade for something purple and spikey.
I'm thinking of raising a boner next ladder. Anyone want to rub, I mean run, with me?