Double post, but I also think my Sorceress might be getting another build change. If the new dungeon is any indication, fights are going to be lasting a lot longer as the game continues on. Burst damage is becoming of marginal use. Rock Press only takes elites down by half where I am, so it might be doing even worse 100 levels more in. I dropped Petrification for Thunderhead, and now it looks like I might go back. Ice Prison will become more useful as time goes on as well, but it would be in competition with Petrification, since my other spells are all so useful.
Anyway, what I really noticed is that Mental Absorb is becoming more questionable. Right now, it is still justified, because I can pop Blizzard on a boss with adds to get full MP in a flash. But as enemy health increases, I might recieve more diminished returns. That is a lot of points freed up!
Lightning stun is becoming more useful, as well.
Also, I wonder this: do any other Sorcs have skeletons? Have you noticed if they have a chance to stun enemies? I want to know if this is due to me having a lightning staff, or if it is a general buff. I wonder if my gear stats transfer over to them at all. I would stack damage res for them if it does.