Sub Door Question, Redoing the Premium Audio package Options

[jbcustom]

So I decided to finally go full aftermarket with the speakers in my celica. problem is that I have the premium audio package. I have a total of 8 speakers in my car.
These include:
8" paper woofers in the door
4"midrange components in the door
3/4" tweeters in the door
6x9 in the rear.

I have already purchased a Pioneer 8600MP for the HU. And pioneer's 3 way 6x9 and 4" speaker. Would any one have any recommendations on subs that will fit the door? I want sound thats loud and crisp. I was going to go with Polk Momo 8" subs. Any further suggestions?

I am going to make sure to get pictures of the project. I plan on moving the battery to the back. I have to do all custom wiring because of a funky "not standard" premium amp (the wiring harness for the 89+ toyotas doesnt match). Any comments would be more than helpful.