Getting a hold of 4 socket armor and a 3 socket helm shouldn't be too hard, and that's 168% right there. The easiest way to add it is by socketing perfect topazes into Armor or Helm. Gloves or Boots or jewelry with +10% or 15% or 30% won't make a real noticeable difference on their own, but as you accumulate more and more items with these bonuses, you'll start to notice that you find more Rares, Uniques, Set Items, etc. You can get MF on most every type of item in the game.
