leftync

I've got an 05 MDX Touring.The speakers are OEM, and I've got access to discount Kickers, so I thought I'd replace them while I have the chance. Any recommendations? Should I go with 6.5" or 6.75"? I don't want to have to make any new holes. Looks easy enough to pry off the grills and drop in speakers that fit.
I recently took out the subwoofer and put in a Kicker sealed box. People told me the stock amp would not power it, but it sounds great.
So, for now, I won't do anything with the amps, just the speakers.
Not sure what to do with the tweeters up front or the twiddler in back.

I appreciate any guidance.