Another good one to look for is "Crimson Tides of Tethyr". And then there's the trilogy of Midwinter Festival, Midsummer Knight's Dream and Midnight Calling.
And as I look at my list of good mods, there is also:
Of Kings and Desperate Men
The Penultima/Penultima Rerolled series (start with Penultima series)
The Seige of Shadowdale
In The Company Of Thieves (2 mods)
Honor Among Thieves (maybe the best thief mod in the vault)
Return to Ravenloft and Ravenloft: Beyond The Gate (connected pair)
Black Thorn if you like solving mysteries (this one is very good)
Others on my list have already been mentioned. This should be enough to keep you busy for some time
Nightowl2