How many speakers are you looking for 5, 6, 7,?
Do you want a sub included in that dollar amount?
The La Scalas are great (if you like the horn sound) for a stereo and don't require much power to drive them to gawd awful loud levels, but may prove difficult, if not impossible, to (timbre/sensitivity) match with a center and surrounds, not to mention their brobdingnagian size.
Even so, they don't plumb the depths of the audio range that deeply. You would still need a sub for the lowest octave or so. Also, finding a sub to play as loudly as them would be a very, very expensive proposition.