I have a Helix Dsp/amp (Match branded) and it works well, but I don't have to deal with input signal correction as I have an aftermarket head unit (Pioneer). Regarding an integrated dsp/amp, you could also take a look and research the Mini DSP Harmony that comes with Dirac Live., although not sure if it has analog inputs. You can purchase it directly from them.
MiniDSP Harmony
I have the Unity 8 speakers from CDT which I think are the ones that are part of the set mentioned above and they are excellent for a wideband.