I leveled my 1.07 sorc from 75 to 84 running Meph.
@yiuman: just saw your set items question. The answer is that partial set bonuses and full set bonuses are provided by the game, so 1.07 Mav's belt will work just fine for your purposes. You could take a full IK set from 1.07 into 1.11, for example, and get the pluses to skills, resists and AR as well as the glowing aura, but would of course miss out on the individual items' co-bonuses.
As for that MPK ring, I believe there is a known bug when crafting cold-resist rings that can cause a field overflow so that cold resist gets added to mana-per-kill. I have one like it, but, amusingly enough, won't use it even though I'd use a set ring crafted by the same method. Why? Afaik, one is an outright bug and the other is an oddity of the game design (where they forgot to tell the game to select a ring quality when crafting).
You do what you want, of course. I'm not trying to moralize or anything, just making conversation.