Great topic--thought of this two weeks ago but didn't know what section to put it in.
Current favorites are stories by QuantumJedi and Anna the Marine Chick. The late, great Braveheart's stories of Sandbridge are really superb. (RIP Braveheart).
Going back in time (pre-forums), start with Cat Scratch Fever from the Raven--the classic of our genre. His sequel, Corporate Catfighting, is just about as good.
A Clockwork Strawberry by Jonica is perhaps the best story on this site. It is the culmination of a long series of brilliant stories by Jonica, Gemma Rox and Laurie Breeze (and others), but can be read as a stand-alone tale. For one person, it is a story of revenge. For the other person, it is a story of a lost soul trying to find herself. Jonica peels the layers of her soul back one by one like an onion, and the effect is amazing. Extraordinary work. (Oh, and the fights are really great).
Luxana and the Glass Ceiling by harpau13--the best of his excellent Luxana stories.
The Meeting by Sidekick--love the buildup, and the fights are enjoyable too.
Hellcats--No Mercy--Linda vs. Susan by The Scribbler--this one may not be on this site anymore. A tale of friendship and betrayal, fought in an underground fighting club.
Between Best Friends by cfwboy--unusual style of writing, but very senual and vivid.
I encourage all of you to go back into the depths of these pages to find some older stories you may have missed or never seen before. A tip of the cap to all of the authors of all styles on this site and others who have graced us with their work.