personally i would go with a mono black and 2 channel for the fronts. this is because 5 channel amps are really expensive for what they do. The sub channel on those 5 channel amps is usually somewhere between 200 and 500 watts rms. Now if the amp fails, you just lost power to all speakers in your car. If you decide to upgrade one or the other at some point, starting with a mono and 2 channel would be best.