I am currently using a 352 Mcintosh Amp with the 803 and I never regret the purchase. I heard that the 6900 is similar to the MC202 + C42. If you have extra few hundred dollars, go with the MC352+C42. They are all discontinued and you can find great deal on Audiogon or Ebay.
Happy Listening :)
Rodney
Happy Listening :)
Rodney