If LaScalas are too large, then I'd look for a pair of Klipsch Cornwalls. A vintage pair can be anywhere from garage sale prices, which could be ridiculously low, to around $900 at the high end. Careful in pairing a sub off with horns. Horns are extremely fast and responsive, which can make them hard to keep up with (though certainly not impossible). There is a hybrid Frankenstein version of the Cornwalls that someone came up with using, I believe, the mid-horns from a LaScala. Appropriately the result is known as the Cornscala. I think you might be able to find some info on the Klipsch forums.
Marco
Marco