I have pioneer speakers in the front too, and rockfordfos in the back. If you have pioneer 6 x 8s then there probably like mine, which are 50 watts nominal. Assuming that back speakers are about the same, I would choice this kenwood amp: http://www.simplycheap.com/ken4ch48amp.html
The biggest advantage is the price, also it is five channel. I have this amp in one of my rides and its quite durable. Although, you can get much better amps, such as the one I have in my 6 which is a soundstream, but these carry a hefty price.
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