Don't overthink it. Look for something that you can sell for about what you pay. Don't consider anything glittery and new that will drop in value overnight. Regardless of what you hear on these forums, sound quality has not had the quantum jump that some would lead you to believe.
When I had Big advents, many years ago, my Marantz 8B had way more power than necessary. That's a 35 watt a side EL34 unit that's a collectible legend of relatively undistinguished sonics. I've had a couple of those and Model 5's. Great look but way overvalued.
Honestly, my Dynaco ST-35 was a fine match for those speakers. You can find a modestly priced 20wpc unit of some strip pretty easily used. Those that have suggested a mid-priced tube integrated are giving you good advice. Don't jump into the deep end of decreasing returns. A good integrated should give you the essence of what you're looking for.
When I had Big advents, many years ago, my Marantz 8B had way more power than necessary. That's a 35 watt a side EL34 unit that's a collectible legend of relatively undistinguished sonics. I've had a couple of those and Model 5's. Great look but way overvalued.
Honestly, my Dynaco ST-35 was a fine match for those speakers. You can find a modestly priced 20wpc unit of some strip pretty easily used. Those that have suggested a mid-priced tube integrated are giving you good advice. Don't jump into the deep end of decreasing returns. A good integrated should give you the essence of what you're looking for.