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go with some image dynamics ctx components, best for under $200. diamond audio has some really good ones, focal, hertz (expensive), mb quart just to name a few. u really shouldnt be playing bass with aftermarket speakers though, they are designed for music, not bass. and if u have the mach 460 system (not sure if u ever said yes or no) u will have to rewire everything because the amps send out an 8ohm load...
u will have some bass, but they arent designed for bass. u should also get an amp to power them if u get aftermarket. u will be happy with it im sure. i would definitely check into those image dynamics i told u about.