After talking to glacier I went ahead and got a Soundstream Pn4.520d AMP. I will leave my front Polk speakers in place so let's hear other options for bag speaker opinions.
Infinity, Polk, Alpine, Pioneer etc etc?
GP will steer you in the right direction.
For bag speakers, and as pointed out, check out the Hybrid Audio 5x7s, Infinity 5x7s, etc. If those are CVO lids then Biketronics has a kit for the 5x7 to 6x9 adaptation and IMO is worth it.