Love my gorgeous powered Audioengine 2+ in red gloss finish with included stands. Those on the desk, paired with cheap subwoofer on the floor, all under $500 not counting the high-end cables that came free from the Currently Disused Cable Drawer. You feel the fresh breeze in your face when the 3" woofers kick in. (That said, I did no comparisons before buying. When now-or-never discount offer hits your inbox, you just buy and don't look sideways).
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.