If you want an imposing speaker with great sound, I would suggest the dual 8" driver JBL Studio 590! They have a muscle car look as @Danzilla puts it! These are 50" tall (measure how tall yours are and you will understand what beasts these are)! But more important, they are well designed, dynamic, and fun speakers. They are the big ones (to the right) in this pic:
Here is a link to refurbished for $430 each, or if you are patient, they have discounted them to something like $469/ea.when on sale 3 or 4 times a year.
The JBL® Studio 590 floorstanding loudspeaker brings professional-quality sound to the home experience. The Studio 590 uses the technology that JBL engineers developed for pro-audio loudspeakers to deliver accurate, powerful sound to your living room. The Studio 590 is a perfect complement to...
www.jbl.com
But honestly, if you buy a new AVR, I think you'd be let down. If you were buying from new, I would push you towards the Denon, but the Pioneer will handle most modern speakers without any issue.