The first thing you need to do is tune your ears... Go to a Hifi store and check out what they have, from the high end to the budget end. Listen to your music not theirs, take your movies, your taste. Listen to everything they have, prepare for a long day and don't let those bishes man handle you, you want to set a reference point of what you want. We all have our own preferences so don't follow the direction of someone else's taste.
Once you get your reference point of sound then work on achieving that goal inexpensively as possible. Buy used, start local, flea market, craigslist is a good starting point, old is good because its not made in China. You have gotten some good advice here because we are not old grumpy men gloating about $20,000 dollar speakers or exotic tube amplification. Well, I am old but I love sound and enjoy sharing my 20 plus years experience. Never take advice from people that hate on Bose, as crappy as their drivers are they work good in the Bose design box.