amp to buy?

Parasound Halo HINT 6 Integrated Amplifier. Probably not going to find a used one yet. If you’re just starting out this will be a beast for you and last you years.

Keep the amp all analog imo...just add in whatever dac you want and connect to a line Input. In this way, you can update or upgrade the dac only and keep the amp. 

Peachtree Nova 300 or 500, has an excellent built in DAC and excellent sound quality. Look up reviews, affordable audiophile quality 

I think you should decide on speakers first and then choose an amp that compliments them. 

+10 for replies suggesting integrated Pre especially for a budding audiophile with limited mobility. Enjoy the music.
Pick your speaker and then build around them.
Consider various options.

Rogue's Hybrid (tube pre with class D amp) Pharaoh is a worthy contender at reasonable cost.