i would see if you can find some Airpulse powered monitors used or Edifiers... there should be something in your price range. I have the Airpulse A200 and they are world class midrange..
Best Desktop Speakers under $500
Will be used mostly for listening to music/podcasts while I work. I will not be getting a sub right now since I'm in an apartment so that is something to keep in mind.
I enjoy nice aesthetics so if they look nice or come in a color other than black, that is a plus for me.