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
Jalanc, I like that idea, of adding a tube preamp. I looked at Monarchy's web site (I don't care fot the web site) but I can't find the item you're describing. I saw a new Pre/Dac that costs around $1500, but I Can't find the one you mentioned. Doesn't the tube buffer do just about the same thing already, though? I thought the Wolfson dac in my CD player was pretty good. WOuld that monarchy's be significantly better?
I'd get either used Plinius 8200 or used Krell KAV300i. They both sold in $1300+- range and great step-up from NAD.
Another option is to try Portal Panache integrated amp.
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.