I use an Onkyo for a receiver but i've used several other items as amp sections.
The processors onboard all these receivers should do an equal job. The amp sections may vary but in general, any good quality receiver should do. The Harmon Kardon and Denons are pretty solid in this respect although i've never had any problems running light load 4 ohm speakers with my Onkyo 797.
I've heard no significant difference between a Denon 2803 and my Onkyo in past listening tests. The test itself wasn't even worth posting.
