+ Omega, + Living Voice
A good friend of mine has La scalas and I totally understand what you are talking about. I had the opportunity to try a set of Omega SAM’s in my system and was quite surprised at what they do. some of the best imaging and musicality I have ever heard. The SAM’s may be a little bass shy I would look at the High Output versions with dual drivers.
I own a set of Living Voice speakers form the UK and they also are a very musical, detailed (but not in your face sort of way) and a large involving sound stage (should be able to fide a used set in your price range if that interests you).
some also mentioned Proac’s and I would also give a + + to anything they make (I’ve not heard a set I didn’t like).