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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Thanks for the many additional ideas. I like the idea of a very efficient speaker, if only because I’d be curious to try driving it with a small tube amp someday rather than my Adcom. I agree about the Atoms. Dull. The JBL and that Vanatoos still sound interesting. There really is too much out there!

These are too much, but the seem like a good, more expensive desktop option— Decware Trapeziums 
I also recommend Audioengine 2+ speakers for true desktop use. Really nice performance for an inexpensive price. Heck, I even got out of my "speakers should be heard and not seen" mode and bought the red ones (really attractive!)
Assuming you are not looking for powered speakers such as AUDIOENGINE, the ELAC B 6.2 currently at $244 /pr. is pretty hard to beat.
I just jumped on these yesterday on Music Direct, matter of fact.  I had been looking at B stock units on Elac America for $209 but got sidelined by a small flooding issue here in mid-Michigan last week.  When I got back around to pulling the trigger on them this week, they were sold out.  A-stock was $349, then yesterday every carrier of the brand seemed to drop the price to $244.  So I pulled.  Looking forward to putting them in the office next week.
The one question raised for me about speakers like the ELAC B 6.2 is whether they'd be much of an improvement over my old Pinnacle PN5+. Indeed, reading about them makes me wonder whether I've been wasting everyone's time here -- don't flame me for saying that! 
http://www.audioreview.com/product/speakers/floorstanding-speakers/pinnacle/pn5.html

It's just that they're so old and perhaps mid-fi that I was thinking that maybe big advances had happened since, well, 1988, and I could easily best these things with even something well under $500.

However, if you were to say to me -- "Dude, you've got no reason to be unhappy with those speakers" -- I would slink away and just move on! So...anyone care to shame me? I can take it!