The choice of an amp should depend on a few important factors, but most commonly those are compromised in favor of price. My first big amp was price first and I regretted it as that dog of an Emotiva would add sibilance and bloated bass when neither was in the recording.
Anyway, I've owned the Adcom 5400, Parasound Halo A21 and presently have a current production Adcom GFA 565SE, which is a different animal from the decades old 565. And a few other amps along the way. The current production Adcoms are very competitive soundwise, if you don't need bling or jewelry.
You need to know what kind of sound you prefer, what the sound signature of the speakers is, and whether an amp being considered will have good synergy with the speakers and move you towards your favorable sound signature or not. Frankly, it's a roll of the dice to expect strangers on the internet to know your preferences, and room acoustics well enough to give any advice beyond general tips.
These days, I'm reluctant to buy a 20 30 or 40 year old amp because they are nearing end of life, or major repairs. YMMV, but with new amp prices dropping while modern technology gives better SQ and build(at any given MSRP) and lower prices(unless you want the bling factor and boutique brand parts), it's often best just to bite the bullet and buy new, or recent.
