Look into Peerless, Vifa, Max Fidelity, Seas and Morel.1) i would like to keep it under $150
The amp's internal crossovers will only work if a) The highpass and lowpass can be used together to bandpass the midbass, and b) the internal xover gives you the crossover points you will need. Otherwise, you need to look into either getting an external crossover, or using the amp's built in lowpass and use FMods to highpass.2) Not sure, I will be running it off a 4channel amp with hi/low pass filters though.
alpine type r's, dont look at CDT first, cause i personally dont think they are as good as everyone has them hyped up to be.