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The Summoner of Leviathan
Firebrand by Marion Zimmer Bradley. Most of works are pretty well received, but it seemed that this stand alone has not shone as much as it should. It is very much similar to the Avalon series in spirit.
Anything by Lynn Flewelling. She is simply phenomenal. I pick up one of her books and I cannot put it down. What is great about Flewelling is that she deals with a variety of issues related to sexuality. In her Nightrunner series the two lead characters (both male) are bisexual, though romantically involved. In her Tamir trilogy she deals with the issue of gender identity and the consequences of it such an issue.
The Fifth Ring series by Mitchell Graham. At first appearance it may seem like a futuristic, LotR rip-off but it is not. Sure there are magically rings and orcs in it, but that is basically their only common ground.
Artifacts of Power series by Maggie Furey. It has been ages since I read it, but it was one of my first fantasy series ever. I simply love it. She takes the old four elements model and makes something interesting out of it. The weakness of the series is that it ends with some loose ends, so there is the feeling that there should be more to the series.
EDIT: A new author that I seems like she'll be pretty good is Gail Z. Martin and her The Chronicles of the Necromancer series. So far only one novel has been published, The Summoner, but it seems to b a good premise for a series. She takes an interesting look at necromancy as a type of magic, looking at it away from the stereotypical model of it being purely evil. Rather she presents both good and the bad sides of it and the difficulties of being a Spirit Mage (a.k.a. a necromancer).