Integrated amp reccomendations


Hey all,
I want to upgrade my amplifier. I would like to stay in the integrated solid state world. I don't want the hassle or worrying about tubes, and a preamp-amp combo is probably out of my price range. My system is a Cambridge Audio Azur 640C CD player, an NAD C370 integrated amp, Sonus Faber Concerto Home speakers, and a REL Stadium III subwoofer. I use Cardas Cross Speaker cables, and Monster M550 Interconnects. OH! I also have a Musical FIdelity X10-V3 tube buffer between the CD player and integrated. I would like to buy a(new or used) integrated that will take a little of the hardness/edginess away from the sound. Give it a more fluid, life-like quality. It has to have enough power to run the Concerto's in a medium to large sized room with vaulted ceilings. The bass is handled by the REL, but I still want that midbass presence out of the Concertos. Lastly, I don't want to break the bank. I listen to everything from hard rock/metal to classical and acoustic music. Progressive rock/metal is my favorite, but of course, being progressive, it has a little of everything in it.

I know this is a tall order, but I need help.
My NAD always received good write-ups. Should I stick with it, or is there something reasonable in price that would be a real improvement?

Thanks in advance!
phoenix469
the cairn 4808 is an excelent integrated .sam tellig of stereophile gave a class a . alan at audiowaves is closing them out for 995.00 . it was money well spent for me. i wrote a review on it if you would like more of an opinion.
OK, it's down to about 3:

Plinius 9100
Musical Fidelity A5
NAD M3

ALl used

I don't want to go the tube route...yet.
Of these 3, for a warm, well rounded, full sound, Sonus Faber 2 way stand-mounted speakers with REL sub, and I listen mostly to rock, which is the better bet AND a step-up from my C370 NAD

Thanks in advance. I really appreciate the help!
I don't know why you eliminated the Dussun V8i from consideration. It's 1600 new, with a 30 day money back. It is warm and full sounding. I had the NAD M3- it also has a warm quality and smooth sound and offers great flexibility. (has tone controls- balance, and plenty of features that other integrateds lack)-read the recent stereophile review as well as the TAS review.

I had the Plinius 9200 not the 9100- great integrated- lovely midrange- nice highs--a bit lean in presentation.

No experience with Mu Fi.