Integrated amp to replace a MF Nu-vista M3?

The Audio Research CA50 is a real sleeper among integrated tube amps. It is not in production any longer, but occasionally you can pick up one on Audiogon, and I guarantaee you that with the right equipment, it is an outstanding audiophile's delight! I have it in a system with the Arcam FMJ CD23 player, Silverline SR17 monitors, Acoustic Zen's Matrix II IC's and Satori speaker cables, with a Dedicated Audio Wattgate PDS power cord on the CD player, and dedicated power lines bringing the juice to Wattgate receptacles. I also cut the fixed power cord to the CA50 down to 12" and put a Wattgate plug on the end. I also use NOS 6922 driver tubes and KT88 power tubes instead of the stock tubes. This system sings! The CA50 produces a wide and deep soundstage with incredible definition and musical timbres. I have had systems that cost 5 times what I have in this one, but I've never enjoyed the music any more than with what I have now! It's a combination of all the component parts, but I can tell you that the CA50 is the heart of it!