I feel this will be somewhat dependent on the Amplification or receiver your using..
Polks are really good for the money.. Mostly perform best with DENON and MARANTZ, Definatley polk with these 2
Also Infinities, and JBL's do pretty good, but mostly cost more and don't sound as good for the value compared to most of the polks in my opinion...
If you want to go with nearing what you can hear in a real theater, or Really live sounding music surround... Used KLIPSCH Speakers are about the most efficient and dynamic sounding anywhere near the price on the market... NEW you might have a problem getting a Whole set including a Sub for 1000 bucks... Used condition it is possible. Klipsch is used in many theaters, funny thing is I mostly see them in Sony and Imax theaters, I have Klipsch now after tons of combos in the past, and they are Relativley cheap, semi compact, and most cost effective with the lowest Power requirements from a receiver I have heard, most models are about 100 db efficient which means with 10 watts you will be at rock concert levels, many speakers in the small bookshelfs in this price range have much difficulty with this...
However Klipsch are not the best match for Denon type receivers, but you can use the Equalizer settings to adjust and make them work pretty well... They work Best with some of the onkyos and mostly believe it or not the JVC Digital and older A-B Surround Amps.