What is the warmest receiver...

Rotel is the only "warm" one in the bunch. I can't complain about Denon sound but if you put bright sound into it, it will come out bright.
You may have to look into some british integrated amps?

Is the receiver going to see duty as a multi-channel processor/amp for movies or will it be used in a two channel system only?

If you're looking for a music only amp and can do without a tuner consider the 100wpc Jolida 1501 RC which uses a tube preamp section and solid state amplification. They go for around $750 new.

Good luck!

Give a listen to NAD. You might like what they offer.

b&k
B+K
B&K.............

You might look into Marantz receivers. The 300 series, to many problems with the 400 series. They are very musical/warm.