Working on a budget isn't easy, but its not impossible to get great sound in used or vintage speakers. Here's a few in your Omaha area, IF you're willing to go out to listen to them, and in one case stretch your budget. Also, in dealing with Craigslist ads, you may want to hone up on your negotiating skills, ask if there's any flexibility on the price, and you just might get a 10 to 25% discount, depending on how sincere you are about possible purchase and if your situation elicits sympathy. Are you a younger guy (less than 25) or middle aged (25-45)?
However, I strongly suggest taking some familiar music with you on a smartphone or iPod and a 3pin mini to double RCA adapter cable so you could plug into their stereo and listen to the speakers. Make sure the music you take is well recorded at at least 196kbit, wave or FLAC lossless to be sure you're hearing the music and not the compression of digital audio. And of course, listen to the speakers, make notes, and make sure they are working, and have the grilles and original drivers.
Klipsch KG2 speakers
https://omaha.craigslist.org/ele/5805553777.html a little over your budget, I've no experience with these but a lot of KG series owners on AK
Polk monitor 7 speakers
https://omaha.craigslist.org/ele/5790988273.html under your budget, pretty good all around speakers
Infinity Qb speakers
https://omaha.craigslist.org/ele/5774687707.html on the dot for your budget, these are also nice all around speakers, plus have upgraded EMIT tweeters, good bang for the bucks spent. Might be vinyl veneer instead of real wood though. Ad is 1 month old though so email quickly to see if still available.
Fried Q/4 signature series speakers
https://omaha.craigslist.org/ele/5818761520.html Also on the dot for your budget, good smooth speaker from well regarded brand from the mid 80's.
Tangent RS4 speakers
https://omaha.craigslist.org/ele/5820198970.html A bit more over your budget, same seller as the Fried (pronounced Freed) speakers, these are very good British speakers, smooth sound, one KEF tweeter needs to be sucked out (dome pushed in), won't play super loud though. Not sure if they have the grilles, and the ad just came up yesterday.
For my money, I'd check out the Infinity and Polk units first, then the Tangent and Fried, I just don't have experience with the Klipsch line. You might have to stretch for the Tangents though budget wise, and if you like loud rock, they probably wouldn't be my first choice as they don't do real loud, but they are very accurate.
Good luck!