just have to be the Elizabeth Lowell trilogy, I noticed you liked them also. I'm going to start Roberta Gellis "Roselynde" next. Maybe you can suggest something in the line of the E.L. books...
As to writers like Elizabeth Lowell, here's my list of whom I think has a similar writing style. Check the author links to get more information. I'd welcome anyone who has other suggested authors, the more the merrier!
Teresa Medeiros
Penelope Williamson
Johanna Lindsey
Christina Dodd
Judith McNaught