Integrated Amplifier with the Good Bass and Extended Highs

I wish I knew more, or had more experience to comment further. When I bought my L-590AX I read all the Luxman reviews I could find, which certainly weren’t a tremendous amount. Most reviewers liked the sound of the two class A amps over the others, and the 590 over the 550. I have zero regrets. Bass is super, and very well controlled, midrange and highs are awesome, great detail, but not bright or forward. Also, from one review that I can no longer find, these amps are really only class A up to the rated 30 watts, and then switched to A/B, and were putting out about 90 watts/channel into 8 ohms.
There is an L-550AII currently for sale here for $2000. This would be a 20W amp, which was later superceded by the L-550AX, then the L-550AXII. It looks nice. For me, I didn’t want to wonder "what if", so I went to the 590.
Good luck,
L.

You might find this worth reading.
http://nordaudio.pl/uploads/pdf/luxman/test/20141202-EN-l590ax.pdf

Naim Supernait 2 is a great integrated amp.

For now I am very interested in Accuphase E-270. I understand that the E-270 won't sound like a E-470 but it should have similar sonic signature.
Power shouldn't be a problem, 90W/8Ohms - 120W/4Ohms since I don't listen music that loud.

I was lucky enough to get a mint Rega Osiris for just over 34% of list price.  At hat price it was a steal.  And yes, it is very good.  I believe that because it is a Rega product, costs $9995 list and it is not fancy enough that they are not a top seller.  And, due to these factors, occasionally a used one come up at, considering it's true quality, can also be obtained very reasonably.  Also if anything ever goes wrong, Rega is totally excellent to deal with.  That's for sure.

<<Krell dealer disclaimer>>
The Krell Vanguard intergrated amp sounds excellent.  It has a large, open soundstage, detail, legendary Krell bass punch.  It's hard to find fault with it.  I use it regularly to demonstrate $28k Magico's.  Runs them effortlessly.  It's the best sounding integrated they've ever made.  I'd add it to your list.  :-)