Best Integrated Amp.

Go look at the variety of tube intergrateds, IE Cary, VTL and others. You'll appreciate the tube sound of an intergrated tube unit rather than solid state. You have efficent and bright speakers and you don't need to addd to the brightness.

I have had the Upscale Audio/Prima Luna Prologue II {40w/ch} in house for about a week and couldn't be happier.As you can see from my system posting,I have had exposure to some fairly pricey gear.I really like the PLII.I would suspect that upgrading the "stock" tubes would improve the width/depth of the soundstage,but nothing to throw stones at directly out=of-the box.Happy hunting-Tom.

If you aren't looking the tube route you should listen to the Audio Refinement Complete integrated. Adequate features combined with a smooth silky sound.

Sugden Masterclass Integrated.

The Class A system puts the sound between warm and brite.
Detail without fatigue.
Quiet background with explosive dynamics.

Accuphase E530 has similar qualities with more features.

Not sure of your price range. Many nice options mentioned here.

I have a Musical Fidelity A 300 solid state integrated (150W X 2) which is very well reviewed in it's stock form and can be had used here for 850-900$. They were $1700 new I think.

I recently had it modded by Tube Research Labs. The fee is $550.

The sound is now at a totally different level. Very smooth, very deep and large soundstage, great bass, and dynamics and detail. The slight edginess that was present before is gone. The noise floor is lowered immensely.
Very happy with it. It has a usable phono stage if you need that.

Good luck in your search.