I am getting a build together and I need to decide between two amps. Powerbass xta 5000d or the I.A. 40.1? I see the powerbass is rated at 5000rms@1 @ 14.4v and the 40.1 is rated at 3600rms@1 @ 12 volts. I hear the 40.1 is very underrated.. Which is the best pick? They will both be similarly...