The Servodrive SPL Runts are probably louder than anything has a right to be. They're also a horn loaded design but they will eat those Klipsch's for breakfast. They run around $2500 per speaker.
Since your buying everything piece by piece. My advice would be to put together a good sounding 2 channel system and then add speakers as your budget allows. 2 halfway decent speakers will sound way better than 5 lousy ones any day of the week.