I am not sure how this question will sound, but why don't you just use the Pioneer speakers, since they play as loud as you like?
Since loudness is of importance to you, if you are going to buy other speakers, look for efficient speakers that are an easy impedance to drive. If you are looking for a pair of speakers for $3500, you could get some used Klipsch La Scala or Klipschorn speakers that would play extremely loud; see:
http://www.klipsch.com/products/discontinued/details/la-scala.aspx
http://www.klipsch.com/products/details/la-scala-ii.aspx
http://www.klipsch.com/products/details/klipschorn.aspx
Obviously, with any speaker, you will want to listen for yourself to see if you like them. Some people swear by those particular Klipsch speakers, while others are less impressed. But if you have only heard the cheaper Klipsch speakers, you need to reserve judgement until you hear the kinds of speakers that made them famous. They are known for their "effortless dynamics", because no sane person ever pushes them near their volume limits in a normal room.