For those who don't have the money handy for a trip to England, the largest collection of Pre-Raphaelites in the U.S. are actually in my hometown of Wilmington, DE, at the Delaware Art Museum. Samuel Bancroft, who was from a prominent industrial family of Delaware of the mid-19th century, bought many of them, and they are now part of the museum's collection. You can see Rossetti's Lady Lilith (below) there.
That would be a nice way to spend a couple of days (Tate). Another with Jane. :')
Thanks for the tip on Wilmington. Below is a link to Paglia's essay on pre-Raphaelite art:
http://privat.ub.uib.no/BUBSY/astro.htm