Many good suggestions so far.
I would suggest you also consider something a little different: In that price range, look around for used speakers in really good shape. If you're patient, lucky, and/or persistent, you'll be able to find a pair of MSRP $800 or so speakers for $400, give or take. Look on eBay, Craigslist, USAudioMart, Audiogon, etc. It opens your possibilities up to even nicer speakers, like the NHT Classic Three, Ascend Sierra 1, etc., both of which can sometimes be found used in the $400 range.
Also, consider PSB B5 or B6. Both are over your price range but can be found gently used for quite a bit under $400.
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