Music Reference RM200 or David Berning ZH270?

Please do let us know Slowhand. In addition to the stock amp there are other improvements that will greatly enhance its performance including upgrading the tubes among other things. Allan Bghan can help you with the "other things" and I would strongly recommend him as he is not only a dealer but a true believer in this great product.

Slowhand,
I have owned a Berning 270 and now own a Berning Siegfried amp. Since you have already committed to Berning, I would recommend several "tweaks" to enhance the listening experience.
1) Address microphonics. All Berning amps appear to be susceptable. I have used Halo's on the tubes and would recommend Symposium or Stillpoints underneath the amp.
2) A good power cord is a must. Try TG Audio or Shunyata.
3) Definitely tube roll. The Svetlana tubes are pretty good but you can sweeten the sound with some NOS tubes. Unfortunately you can't roll the output tubes.
I have found the combination of the above factors to have significantly improved the sound. Overall improvement in bass,less sibilance,sweeter midrange,increased clarity.
Enjoy listening.

Thanks guys, I have the TG Audio cord now and will check with Allan on the tweaks.

Be aware of 7-8 year old amps passing as new, there has been several changes since then.

The output tubes are very important as well, that is why I offer hand selected cryogenically treat outputs on mine.

Well guys, my deal on the ZH270 fell through. The seller misrepresented himself and the age of the amp he had for sale. The amp may be just fine for all I know, but I choose not to deal with someone who rates a product a 10/10 and I find out from Berning that it is 7 years old.