Here's a list (excluding Elminster and Khelben Arunsun who everyone knows about)
Larloch the Shadowking. 46th level Netherese lich (evil)
Alassra Shentrantra, Chosen of Mystra and Simbul of Aglarond, 30th level sorceress (chaotic neutral).
Halaster Blackcloak, 30th level human wizard (evil)
Szass Tam, 30th level Zulkir of Necromancy (evil lich)
Laeral Silverhand, Lady Mage of Waterdeep, Chosen of Mystra, 24th level mage (good)
Endue Alustriel, High Lady of Silverymoon, Chosen of Mystra, 25th level mage (good)
FYI Manshoon of Zhentil Keep is a 19th level wizard with a lot of clone spells.
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