If you want gobs of detail in that price range I would recommend the Martin Logan Aerius (i--if you can get it for <$1000). You will sacrifice some of the bass you've gotten from your 603s, but you will gain a tremendous amount of detail, air, and transparency. If you have not listened to Martin Logan's you should to see if they are the right type of speaker for you--they are not for everyone--and speaker placement is very critical.
