Jeff Rowland to what?


I currently own a Jeff Rowland 625 S2 amplifier. I'm curious as to what amplifiers I should listen to below 20K, new or used. I'm not unhappy, but I'm curious. The amp will be driving Monitor Audio PL500 II's. The preamp is a Jeff Rowland Corus.

ricred1
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.

If you haven't tried a good tube amp, do yourself a favor and change course.   VAC Phi 200 monoblocks can be had used for around $10 to $11K.  Also available now is a VAC Phi 300.1 for $8,900.