Always good to have overhead, that sub can prob handle power decently too. I don't think you'll have trouble with overpowering it especially if you set the gain right.
Basically don't get too upset, noone is ever happy with their car audio. I have a setup I would have considered awesome years ago but now I just want moar haha, but in all reality I have a very nice system and everyone who rides in my car is impressed. Stick with us keep asking questions and learning and we'll help you get a system that is better sounding and louder than your friend's. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif