Thanks for the replies everyone! Full disclosure, I have not actually had the opportunity to listen to the Audio MASS speakers or the sub I mentioned. I was basing my decisions on these articles (which say the speakers and receiver are a good pair):
https://www.themasterswitch.com/best-home-theater-systems
https://www.themasterswitch.com/best-subwoofers
I also tried reading reviews, which were generally positive (although there aren't a lot of them). I can probably work with bigger speakers (girlfriend might take a bit of convincing), but just from those articles, it sounded like they were the best in the price range. Like I said, I'm a complete beginner
I honestly don't know where to go around me to listen to any of the speakers. There are a couple businesses that might sell higher-end speakers (by that I just mean better than what Best Buy sells), but they are a bit intimidating - they all appear to be by appointment only and appear to mostly be in the business of building home theaters (as in, the actual physical space) for the wealthy, haha.
The $3k is for both the receiver and the speakers.
I'm in the U.S., by the way.
Thanks again! I'll try looking into some of the options you guys have mentioned, but it just seems hard finding info on the internet.