Multi driver channel speaker choices that extend low to run with Submersives?

Hi, I am wondering if any of you could give me some direction.

I am going to be running dual Submersives in a dedicated theatre room in the basement that is 13x45 with 9 foot ceilings.

I want screen to be a 16:9 ratio and full wall width, so I can only go behind or below the screen for front speaker placement.

I want to go below.

I am considering center channel speakers on all 5 positions, I believe the extra drivers would carry the sound to a low enough frequency to blend well with the submersives, but I feel there may be a gap in the mid-bass.

This is why I am not leaning towards basic bookshelf speakers.

1) At USD budget of $500-600 per speaker, could I get some feedback as to what brands I should be listening too.

2) Am I going to need to run additional 8-10 inch subs set to fill the mid bass gap or will there even be one?

Thanks in advance guys.

Jeff

Thanks for the post Mike, if a center is only able to extend to 75hz like the Outlaw... the submersives can go that high without any problems and with good blend?

I really appreciate the feedback

Jeff

a couple hundred? In Canada that translates into $5000 for 5 speakers