There are many good choices depending upon what you find on the used market. I've favored Nelson Pass designed Adcom amps for their value. You have to smile at his speculation as to how they were designated GFA.I'm in no rush to buy anything, and am just getting an idea of what I should be looking for. Do you have any recommendations for something with up to maybe 200 wpc in the used realm of maybe $500 or less?
I've owned various NAD products which also are good performers. OTOH, current Crown switchers are pretty decent and great values for the money. I used an XLS-1500 for a couple of years in the garage system. Very smooth sounding with nice midrange. Unfortunately, the top end lacks extension. Not objectionable, but harmonics just hit a brick wall and die. They also include both high and low pass crossovers for bi-amping or subwoofer duty. You can usually pick up one for under $300 with 300 W/channel @ 8 ohms.