Integrated Amplifier with the Good Bass and Extended Highs

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.  :-)

Vitus RI-100. Be patient. You can find them here for around $7000. Best money you’ll ever spend…..