The KEF Q350's are a really fun speaker - I couldn't personally live with the LS50 but the Q350 have really good boogie factor going for them.
There are a pair of B&W's that go for a bit more that are also supposed to be really good bookshelves not sure which model but probably still in budget.
There are a pair of B&W's that go for a bit more that are also supposed to be really good bookshelves not sure which model but probably still in budget.