Speaker options - 1st-Gen KC

I want to install a new nav head unit, that's no problem I'll buy from Crutchfield. The factory speakers (just 4) are shot. I really, really want to avoid messing with the door panels to replace the door speakers. They never go back on right.

What are my options for really good surface mounts? I'm thinking tweeters up on the A-pillars, something under the seats and another pair on the floor up against the back wall of the cab.

Is this a good way to go? Please don't try to convince me to open up the door panels - not going to do it.

Thanks for the help.