What is the warmest receiver...

I had an old NAD T-770. It didn't have a bunch of whistles and bells but it had an extremely nice sound. A bit of a funky interface though. Much warmer sound than the Lexicon/Chiro system that I replaced it with.

Listen up! The only one on your list worthy of powering the Leisure 2's is ROTEL. I'm using the 1080 amp (200 watts) with the 1090 preamp and it's very clean. Give it a try and don't waste your $$$ on the others.
Robert

well if we are talking solid state here, lets see.thats a tough question. ive owned 1000s of vintage stereo receivers over the years, but in tonal depth, clarity, and warmth all around im gunna go with the marantz 2230.

another good middle of the road one would be the H/K 330b. one of the cleanest ive heard in awile.

but two other receivers, that are as close to tube as you can get, in my opinion and personal experiance, is the marantz model 18 (original woodside, ny version)
and the low power fisher 200t.
*both are early solid state ones from the mid-late 1960s and were being manufactured wile the tube stuff was still avalible new, thus using alot of the same inside components,