I would like to purchase a new integrated amp. The top of my budget is $1000. For years I had mostly vintage amps, Yamaha CR-820, CR-620 and a Marantz 2245. The Marantz has been in use the last 8 years and finally I had to retire it. A future project. At the moment I have a Yamaha RX-397 filling in. This will be mostly for vinyl and CDs. I have no digital or streaming music. My equipment consist of Polk Monitor 10Bs and Technics SL-1210mk2. I been leaning towards a Yamaha A-S501. What are opinions on the 501? How does it compare to the 701 and 801? The 801s USB and DAC might bring me into modern times. And can I use the additional power of the 801? In that series, 301-801, does the 501 fall into the sweet spot? I mean the best bang for the money? Will it have synergy with the Polks? Compared to others like Marantz PM6006, Nad D3020, Rotel, Cambridge etc. What else should I consider? Thanks for any thoughts, opinions, suggestions etc.