mid fi choices NAD vs Adcom vs Rotel ... $400


I know its not a lot of money is this world. I want to start small and work my way up. I know i'll be buying older equipment. Is it just personal preference with these brands being considered to be the same class of equipment? I've also noticed some raves about a particular Yamaha and Onkyo model. Don't see too much about Denon, which i thought was in the same class. Anything else i should be searching for?
fivefasts
Vintage Marantz and Sansui...Marantz 2250 for sale on this site ( new today ) ..Could work real well...
Familiar with all three, I prefer the NAD and owned 2 pairs of the 370 integrated at one time. The NAD is more full bodied and has delicate highs. In my experience the Adcom has tighter but thinner bass while the rotel can become fatiguing with the wrong speakers, again based on my experience. The adcom was amp/and pre (I think 545 II or something like that) Rotel was amp only can't recall the model but had the heat sinks on the front...

The NAD is a safe bet.