I can't answer your question on the head unit however on the Hertz speakers and amp I can. I absolutely love my Hertz HSK165 6.5" speakers and the amp I have hooked up to them is the Hertz HDP5 which I am using to also power my JL 10" sub. The speakers sound great with the amp. Between that amp powering the speakers and the sub it is more than enough bass for me. Even though I have a 5 channel amp I am actually running it as a 3 channel amp.
I can't say if thats the best amp for the speakers but I can say that the speakers sound great and I couldn't be happier with them. The Hertz speakers that I have provide a rating of 125 RMS. The amp can power up to 200 RMS so I can't go any further then that. I purchased the speakers for around $400 and the amp was around $480 I believe.
Wicked CAS sells Hertz speakers so they could probably give you a great deal on them. Also Bigaudiofanat is a big proponent of Hertz speakers and I've seen him suggest them so they are well liked I feel.
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