Horn loaded vs. dome tweeter
Go to your local BB or CC store and listen to their Klipsch speakers. If you like the sound of the horn loaded tweeter and your primary use is for HT then you will like the Acoustech line. If you listen to mostely music, then stick with the Venturi line of speakers.
Some people like the horn loaded tweeters on Klipsch and Acoustech speakers because they are very efficient and can play loud with less amplifier power, but they are not for everybody.