Jeff Rowland to what?

If you like the Rowland sound, Pass, BAT or CJ would be good choices. Ayre is a good choice as well, but it sounds different than what you now have. You have to listen to it first. I used to have both the Rowland 12's and 112, and now use 2 Ayre V-5's. Ayre has the best imaging out of any solid state amp I've ever heard. Rowland usually struggles in this area. Dynamic contrast and timing are also the best I've heard from SS. One advantage Rowland has it that its more forgiving. If you like a really laid back sound, you may want to keep your current amp.

jmcgrogan2,
I submit I need as much power as the 625 S2, because my room is 20’ x 26’. I hesitate with Pass because they get so hot and I live in San Antinio, TX. I use my Rowland in my surround sound to drive my front speakers and I don’t want a heater.

sfall,
I love the Rowland sound. I’m just curious if there is something out there that will improve on what I have. Yes, I like a non-fatiguing, laid back sound that still provides detail.

I have the Rowland M312 driving Avalon Indra's w/synergy lli pre amp. I have auditioned in my home the Pass XA100.5's, Bryston 7BSST and Arye MX-R monoblocks. They all are superb amps. There is something special with the M312/Indra combo. The Indra's need a lot of current and perhaps that is why I preferred them over the others. Also do like the fact they run cool and are energy efficient. The Pass amps were small heaters. lol.

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?