KRK Rockits should do fine, or Tannoy Reveal 501p's, or M-Audio Studiophile AV40's.
Griff, would it be the Tannoy 501a
's (assuming the OP won't have an amp to run the p's)?
In about that same price range as the KRK's and the Tannoy's, I would also look at the Equator D5's ($300/pair) - I have them and like them a lot.
The JBL LSR2325's ($400/pair) are also an option, and they're at Guitar Center/Sam Ash so easier to check out in person.