For the $140, I wouldn't go with a Dual Audio head unit... that's pretty much a Wally-World special.
If you're using Sony speakers, the logical conclusion is to use a Sony unit as well, but one with all the features you're looking for. Lots of Sony units have AUX inputs, some have spare RCA's on the back for an AUX input as well. You can buy them right along w/ the speakers, and most are under $150 (that may have changed since the last time I cared to look).
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