Hi Steve, The sound of speakers is purely subjective, so what may sound great to you in your room and your system, may not sound great to someone else. Regarding what would be a good replacement, would depend on the rest of your system as well. The sensitivity and overall impedance of speakers also dictates what will work with your amp or receiver. The Advents lack lots of low bass, and also generally have a recessed midrange. They are somewhat efficient though, not requiring much power to get them moving. The Klipsch speakers (and all other Klipsch speakers I've ever heard) are generally brassy and bright sounding. In my system they have all sounded terrible. In order to provide you with better help, can you please tell me the following?
1) What is the Brand and Model of the receiver or amplifier you're using?
2) Do you typically listen to vinyl, or digital sources?
3) What is the general type of music you'll mostly be playing (orchestra, blues, heavy metal, classic rock, blue grass, funk, all of the above)?
4) What is your budget?
5) Are you still planning on running the SVS subwoofer?
Also, please note that I will be stepping away from noon EST and will return around 3 p.m. to be able to view your reply and then provide suggestions.