My vote goes to Coincident Speaker Technology's Total Victory. I own a pair, and the reason I love them is they are full-range, lively and detailed, musically and sonically coherent, are build like brick outhouses and can be driven by pretty much anything. They sell for $11,500 USD new, so they'd be well within your budget if you can find them used.
http://www.coincidentspeaker.com/total_victory.html
http://www.coincidentspeaker.com/total_victory.html