Right now I got Presonus Eris studio monitors, however studio monitors might not be to everyones taste because they have a flat response. But I use them because they help hearing speech in modern movies because they don't drown out the mid range.

The very best deals change every few years though. As soon as word of mouth catches and something becomes too popular the business suits look for ways to take advantage. Scrolling old school style forums for audio enthusiast s can lead you to some good lesser known (and thus cheap) brands though.

It really depends on the music you listen to and what your ears are already use to.

I thought my fathers old setup always sounded amazing when I was younger. Coming back to it 20 years later though, it sounds stupidly scooped to my ears. Same speakers but what has changed is the music I was playing on them and what my ears expect to hear. 20 years ago I was more into guitar/bass/drum/vocal music that these speakers were made for.

There is really no such thing as "sound quality". There is just different EQ, frequency range, etc.