Apart from the above advice I would add that:
-- used spkrs are a good idea
-- no point in buying spkrs FOR yr present equip / buy spkrs that you like (and can be driven by what you have)
-- 5k is a lot of money - and for used spkrs buys you a lot and well superior perdormance to yr present equip!
-- prepare yourself to be boggled by the choices out there: they're endless!
-- enjoy yourself as you're looking for the "right" pair
-- used spkrs are a good idea
-- no point in buying spkrs FOR yr present equip / buy spkrs that you like (and can be driven by what you have)
-- 5k is a lot of money - and for used spkrs buys you a lot and well superior perdormance to yr present equip!
-- prepare yourself to be boggled by the choices out there: they're endless!
-- enjoy yourself as you're looking for the "right" pair