Without a subwoofer, you will need tower speakers for full range.
You can do a free in-home audition of the Aperion 533-PT for $1,200/pr (free shipping both ways).
The SPL vs Frequency graph (Aperion) shows 25Hz-20kHz +/-3dB or 20Hz-20kHz +/-10dB.
If you don't like it, just send it back.
http://www.aperionaudio.com/product/Intimus-533-PT-Powered-Tower-Speaker,32,28,168.aspx
Another option is the Definitive Technology BP10Bs: 25Hz-20kHz +/-3dB or 20Hz-20kHz +/-6dB (Julian Hirsch).
You can get these for $700-$800/pair brand new, retail is $1,000/pr. Only problem is, it might be hard to find a free audition.
http://www.definitivetech.com/loudspeakers/bipolar/bipolar.html#bp10b
Another option is the Def Tech BP7006, which has about the same spec as the BP10Bs. You can find those at Best Buy Magnolia HT. Retail is $1,200/pr, but street price is around $850.
My favorite of the 3 is the BP10Bs.