Re: Shopping for Wands
A few computations:
A rare Unearthed Wand, with ivl 1 has affix level 73 and could get Necromancer's (+2 all necro)
A rare Lich Wand with ilvl 1 has alvl 51 and could get +2 necro.
A rare Ghost Wand with ilvl 1 has alvl 33 and can't get +2 necro.
So don't waste your time with rerolling 6-pskulls on Ghost or Polished. It does look like one of the exceptional wands couid work (Grave). I wouldn't spend skulls on this, though, as AoKL is much more manageable to get. In order to get +3 RS/+3 SM, it may help to know that there is only a 10% chance of getting +3 staffmods, once that staffmod is chosen. So out of 100 wands that have both SM and RS, only 1% on average would be +3/+3, and then you would also need at that moment to roll the desired +2 necro. Good luck! (By the time you get that, I'll climb down from my stack of Tyrael's to congratulate you...)
Seriously, for rerolling rares, I think the most compelling things are diadems or possibly LLD gear, particularly rare LLD jewels.