Best small, desktop speakers, $500 or under (new or used)


What small, nearfield (3 feet) desktop speakers do you use or like?
I'm looking to fit out my desk with something good but not expensive.
Music tastes are varied and I don't care about deep bass. I'd rather have good mids, highs.
Spending is capped at $500 max. Open to used, new. Would power these with Adcom separates, 60wpc.
Elac? Ascend? KEF? What would you advise?

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I’m running the kef ls50s off Class D near field in the room below where the Vanatoo are and agree 100%.  Listening as I type.  
JohnBlue jb3 - Nice sounding single driver speaker designed for desktop, or standmount, listening. Great for nearfield listening. I used to see them mentioned here occasionally, but haven't in a while. I don't know if they have any US dealers. I bought mine several years ago  directly from JohnBlue in Taiwan. I just clicked on the "Contact us" button on their website.