Pick your priorities:
Power
Sound
Cost
Which order suits you? How loud is too loud for you? The Sidewinder and Brute are loud, but perform great. All other full systems, loud, but quieter than Sidewinder/Brute, but slightly lower performing. Crossover and ToRs, slightly louder than stock, again, slightly lower performing.
How loud is too loud?
With CES you can't be sneaky speeding, when you're on it, people around you will know you're on it, same with the other full systems.