What new Pioneer radio with back up component would replace my old unit

It sounds like your question should be either, "What Pioneer unit is compatible with my installation (Car make/model)?", or the question should be "which new Pioneer model would be comparable to the level of quality of my original unit?" Both questions have a similar answer.

Pioneer has a full range of quality levels for their products including the Pioneer "Premiere" line, on down to the basic models that have very few extra features. For either question the answer would be to match the Pioneer model with all the same exact features as the original unit, and that has similar performance specifications. This will provide the quality that you are accustomed to. If an earlier model of the same quality level classification fit in the particular car you are driving, then its predecessor model will probably have very similar physical dimensions and should fit nicely too.

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