At such a limited budget, I advise you stick with 2way only. Possibly 2.5 way, but I don't think it's possible even as used for anything worthwhile, when your budget includes the electronics. Even if you were willing to go DIY on speakers, would I still recommend 2way. Forget "subs".
If I were in your shoes, I'd build a pair of ER18s for $550 in parts, and scrounge up whatever receiver I could with whatever is left. It will likely be a well superceded HT receiver, generations old, without any modern features. I would use the amplifier/PS as the #1 consideration. You will have to learn about how to find 3rd party measurements, and then correlate that to the value of a used market item.
If you want to buy new, you will have to settle for less power. If you are unwilling to build speakers, you pretty much have to settle for bookshelves without much bass response if you want anything worth writing home about. These are my opinions.
If bookshelves are ok, then there are the looks. If ugly is fine, I'd look at studio monitors, and possibly Ascend 170SE, maybe some PSB Images as superceded and used.