Jeff Rowland to what?

I personally don't feel that you can improve on a new current-production JRDG amplifier for under $20K.  If you get a tube amp or a tube-hybrid amp you "might" get a result you like better, but for pure SS i don't see much real improvement in the way of refined sound or build quality.  
      If you want a significant improvement in most areas it's time for
a VERY good pair of speakers.  A 20x26 room (damped? undamped?)
is really quite a lot of space to deal with as well.
     I am a snob when it comes to evaluating listening material- classical music is SO much better recorded on average than anything else IMO
(acoustic folk and female vocals usually qualify as well). So,
IF your stereo system sounds good on Beethoven then count your blessings.  If your preference goes to pop music, "cool jazz", hard rock, etc. then fussy components like Rowland tend to sound a little "off".  In my book that's an acceptable trade-off.  

I've owned Wilson's, Aerial, Devore, Revel, and a couple more. Prior to purchasing the PL500 II's,  I listened to Rockport Aviors, Raidho, Dynaudio, and Magico S5s. To "my ears", the aforementioned speakers can't touch the PL500 II's. What speakers do you recommend I listen to?

I have been very satisfied with a pair of Herron Audio M1 amps.  I'm pretty much focused on sound rather than artistic cases or how much an amp costs and the Herron equipment never disappoints.  Without any consideration for cost, the Herron M1s would be on a very short list.

french fries has your frites

get better speakers (esp. if the ones you have now cost less than 10k)

randy-11,

I honestly appreciate suggestions, but I submit they’re more valid when the individual is familiar with the component they’re suggesting you replace. I post questions in hopes I receive suggestions that I haven’t thought of. If french_fries, has heard the Monitor Audio PL500 IIs and doesn't think they are Very good, I respect his opinion. If he hasn't and is just saying something negative for the sake of it, he doing everyone following this post a disservice. I understand everyone has their preferences; therefore I take every suggestion with a grain of salt.