There is a lot of gear out there that may suit your needs. Indeed, WHF magazine has articles on budget speakers and amps that may help. If you can get yourself to a dealer then perhaps you could audition some stuff.
You mentioned $'s and so I'm guessing that you are in the USA?
If so, Hi Fi stores really don't exist for us. Those that do exist specialize in high end home theater equipment.
So you're left with 'Best Buy' or buying on line through Crutchfield / Amazon / B&H etc.
You can also buy directly from many manufacturers, with free return shipping if not satisfied e.g. Cambridge Audio / Q Acoustics. I recently picked up a pair of Q Acoustics 3050's for $400 direct from them and they are pretty good floor-standers (now out of stock).
If you require streaming, perhaps a WiiM amp? There's a ton of decent speakers in the $300-$400 price range.
Personally, I would steer clear of used gear, unless you can audition it first and absolutely never buy used on line.
Shame you don't live close, I could sell you my old 'near mint' Yamaha R-S300 / Infinity Primus 163's for a couple of hundred $'s! LOL