The Stock head unit already good for an Evo lor.....if you keep your Evo in stock condition...then you can consider into upgrading your sound system to mid range or High End SQ product. Kicker is not a bad brand cos will give you more kick in the sence but remember to get the original one and beware of Orang Cina one.
In other word that if you plan to opt for more fun / performance on your ride better dun waste your $$$ for the SQ, Plan your $$$ to get Inter-cooler, Clutch, Defi, Apexi, HKS, Greedy and etc..... is all your choice to look for...
Happy moding....