I use a Niagara 5000 and 7000 in a couple of my rigs.
If you don’t feel like spending all that much, get the powerquest 707.
In addition to the filters and protection, these units maintain/supply a current reservoir on the high current outlets for your power amps. It is like an adrenalin shot for any poweramp and can make your amps slam like crazy on demanding tracks at high spls. After you get used to it, you won’t be going back.
P.S. Only the Niagara 3000, 5000, 7000 and the Powerquest 707 offer the above mentioned. Other AQ models don’t.