The Importance of Being Earnest was done in 2002 with Rupert Everett, Colin Firth, Reese Witherspoon, and Judi Dench. I enjoyed it and found Dench to be a great Bracknell.
Everett also did An Ideal Husband in 1999 with Minnie Driver, Cate Blanchett, and Julianne Moore.
It seems like there were lots of rising Hollywood A listers doing British costume dramas in the late 90's and early 00's!