Integrated Amplifier for Monitor Audio Silver S2 Speakers

@yogiboy
 
THANK YOU for the advice but I would like stay away from the tube Integrated amplifiers since I'm listening music all day long. Sometimes is always on. I know that the best sound comes with the tubes but I prefer SS Integrated amplifier which I should mention.

My good friend just recently bought Accuphase E-370 and he was kind
enough to bring an Amplifier just to hear the difference. 
Of course, I shouldn't to this because I cannot afford such amplifier but the sound was.........what to say, tight controlled bass, beautiful highs and details that I could tell where is which instrument. He also suggested Rogue Audio Cronus Magnum amplifier but as I mentioned in posting, I would like to stay from tube amplifiers.

@paraneer

I've listened Accuphase in my apartment with my modest set up (OPPO 103 as a source). Signal Cable (all cables). My friend also brought his
Cardas cables but the difference wasn't like a day or night. All in all, I clearly heard a lot more details. Of course not even close like with his set up: Accuphase E-370; Monitor Audio Platinum PL300 speakers and Luxman CD Player.

@ knownothing
First of all, HAPPY THANKSGIVING DAY.
Thank you on your opinion. Very  helpful information. I did replace jumpers with the Cardas dedicated Pre Amp. / Amp. jumpers. They are
available only from Music Direct. The highs improved but of course they didn't improve everything. It's still NAD house sound just slightly more open.
I decided to stretch my budget so now I am considering Hegel H160 but
unfortunately the dealers that carry Hegel don't carry MA speakers. So I would like to see opinions on this pairing, Hegel + MA Silver.
Thanks in advance on your opinions.