I found HotO + pdiamond Whitstans to be a good teleporting combo (with Vipermagi). Then ist Occy + Rhyme for kill switch..
The faster block rate + low dex requirement of Whitstans is impossible to beat, and with HotO you have a bit more mana than with the occy. And the HotO also provides resists that Whitstans lacks. I did an informal test comparing HotO to Wizspike by spamming tele's with each, and I seemed to lose mana faster with the Wizspike.
I haven't found a Skullers yet; maybe I would have to swap out the HotO or Frostburns if I found one, or if I find more Tals gear, but with ptopaz Shako & Viper, jewelry, Gheeds and other charms etc I have around 400 MF and don't really need any more.
I guess the issue with sorceresses and HotO is that the sorc, as a dedicated spellcaster, has a lot more items that provide bonuses to casters. Especially ones that beef up her offensive capability. I'd say HotO is mainly aimed at non-sorc classes.. the ones who could be primarily spellcasters but need access to sorc-like items to do it. I.e. as others have mentioned: hammerdins, ele druids, singing barbs and the like.
However for a source of +skills, FCR, mana and resists on a switch, the HotO is still pretty nice for a sorc. I haven't found all of Tals yet, and I hate trading, so take this perspective with that in mind.