I would get enough channels to do what you have now and a sub. Along with minimum of 2ch pre outputs for future expansion. Maybe 4 preouts. Example 6 ch plus 2 for sub now(8). But if you wanted a larger sub amp later and you could use the current sub channels to go full active on the dash mid/tweets and preouts to a sub amp. Basically only buy something that can get you to 10ch minimum and you will be set and not waste money.
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