Since you've already upgraded the power. The only reason to upgrade the HU is for more options... HD Radio, USB, etc. If you don't see yourself using these save the money and time to install.
Biggest bang for your buck will be speakers and power.
Personally I never saw a reason to drop big bucks on car audio with road noise, off center driver position and speaker positioning issues. You'll never come close to what a home stereo will be. Plus I don't use the Z for road trips.
If you do want to go for the best sound there are some amazing EQs (digital sound processors) on the market now, but it won't be cheap.
Last edited by Ronin06; 05-24-2015 at 10:55 AM.
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