Would help greatly to know what sound reproduction characteristics are important to you, what type of music you listen to and how loud, etc. That said, agree with others that speakers are the place to start and then choose an amp that matches sonically with them and that can drive them properly. Then go from there. If you don't get speakers you love you'll never truly love your system, so do whatever you need to do to get that right.
If you lean more to classical, acoustic jazz kind of music where imaging, soundstage, ambient cues, etc. are important I second something like used Silverline Prelude or Minuets. Very good all arounders that can do the audiophile nuance stuff well. If you're more into loud rock and need slamming dynamics something like the Tekton Mini Lore or one of their larger models used would be a better choice. Anyway, as others have said, it's best to go out and start listening to some speakers with your music so you can start to identify what you like and so you have a more defined idea of what you're looking for. More useful and productive than reading our blabber IMO. Best of luck in your search, and have fun with the whole process. You'll learn a ton, which makes it even more fun.