I'm locked into the Alpine ecosystem for headunit and amp plus the Polk 5.25/6.5" combo, mainly because I've already installed it all! I was shocked how small the 4x45 (I think) amp was - even with the giant bundle of wires it comes with I was able to install it in the dash behind the radio for the ultimate stealth install. I'm not at all opposed to 5/6 channel amps, but for me it'll be a small, probably class D, mono amp being added, maybe under the wheel, but likely under the center dash depending on size, just to keep it all in one place.
Decisions decisions...
Decisions decisions...