the right speakers

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

Sorry; I wouldn't run 5k speakers with a Pioneer receiver; unless I knew I would be replacing this rec. soon,(and this was just a temp. solution).___ Now if this rec. has pre outs for the fronts;hook you up any of many cheap 2ch amps.

You will need to give more info, room size, personal taste in music, what you are looking for in sound...all this is needed for any useful info.

If you can get a an audition with Wilson Benesch line, do your self a favorite. A pair of WB Discovery or Curve used is about $5500 but is hard to find. Ditto what Warnerwh said. It is a very subjective thing finding a pair of speakers you love. Have fun.

What size room will they be in, and what are your musical preferences? There is not enough information given for you to get back anything other than someone suggesting their favorite speaker, which will be useless to you!