The Cerwin-Vega's and ATC's mentioned above are a good idea.
At the high-end of your price range is the B&W 801N (the successor to the Matrix), which can be had for around $4k now used if you are patient, but they require bi-amping with powerful amps to really do their thing and are thus effectively more expensive.
At the high-end of your price range is the B&W 801N (the successor to the Matrix), which can be had for around $4k now used if you are patient, but they require bi-amping with powerful amps to really do their thing and are thus effectively more expensive.