I am upgrading my stereo on a budget in my dodge ram. I'm putting a single 10 under the rear seat and only need like 300 watts for that. Eventually I'd like to power the front stage, but not necessarily right now. It seems easier to just get a 5 channel amp to have it all ready to go, but a mono amp for the sub right now is cheaper and I can add a 4 channel later. Is there any issues with power draw with 2 smaller amps vs the 5 channel? I get it the 5 channel craps put I loose everything but the rest speaker.