My best upgrade was the center channel to psb Imagine XC, a year ago, and within budget. Dialog at all volumes, is very distinct. The dialog is coming from the screen, with it positioned directly under the 55," at ear level.
For FL and FR, I did try JBL Stage A130's earlier this year, for my small room. That sure was an ERROR!. I reverted back to my Klipsch that were toed in, and repositioned to straight out. What a difference that made for listening, from these R-51M's, both for movies and Mp3. I'm good.......for now.