mmm.. from your setup, I guess you want to use 1 single amp for your system.
For better SQ, I would recommend the PPI or ADS amp and use it to run your front active. On top of that, add a line driver to the amps as the 5550MP has a 2V output only. A higher voltage will yield cooler amps and more solid bass.
This will be a best choice for u to use the current stuff you have and just add on an amp.