it’s tricky because if you go to passive speakers, you would need an amp.
You can get a decent vintage receiver for under a $100, on ebay, craigslist or shopgoodwill. I would go with Denon or Yamaha. You can’t really go wrong with it. But you can add Onkyo, Adcom and NAD to the list too.
For speakers, again no need to spend a $1000. There are a lot of vintage speakers that sound great. Cambridge Soundworks, Celestion, Boston Acoustics, Monitor Audio, Paradigm, etc. The key is to find quality and avoid junk.
People here spend many 1000s a year on cable upgrade alone. They can’t really make meaningful suggestions for a system that has no quality component (maybe your CD player is OK) especially the Rega 1 is despicable. I am saying this as a Rega fan, that version should not exists.
(I am terrified by the Wavetouch Audio WT-95 idea that would "take" your $1000 and would leave with you where you are right now. And coincidentally, the person suggesting it is the person selling it. Ouch. No.)
You can get great sound from vintage, quality components. Just do your research or feel free to pick our brains. Knowledge substitutes a lot of $$$ in audio.