At the $350 - $400 new range, there is only such much difference between products. Since your concern is primarily on a warmer than neutral overall system sound, then just make sure that you buy from a place where you can return something if you don't like it.
I owned a HK 3370 about 10 years ago and liked the receiver a lot. It was pleasing sounding. It was not hifi as described by the stereo magazines, but I used it everyday and enjoyed it. It was built only so so and shorted out when the two speakers wires touched when I was shifting the unit on a shelf.
If you do not need the tuner portion of a receiver, you can also try Emotiva amplifiers
. They offer two amplifiers in the $200 range, which may be of interest to you.