Speakers that fit...
 

In the doors of an 02 F-350. I want to upgrade my stereo, going to amplify whatever I install. Whats pretty good these days?

Yeah! 5X7's baby!
Ok, seriously though....I would recommend getting some 6.5" component speakers in there with a custom baffle. Put the tweet up in the sail panel or even better, the A-pillar. That said, the possibilities are pretty much endless with what you want to go in there. Prices can vary from $350 for some nice comps all the way up to $1500+ for some really nice comps.

What amplifier are you planning on using? Maybe you should come by one of the sponsor's shops to have a listen on a demo board or better yet...a real car!

Because Im broke and lazy and wont be doing this for a while. I have no idea what amp I will use, all I have is my deck installed (Kenwood Excelon), and I wish I could find a box that would fit a 12" behind the rear seats.

We can make just about anything work. Once you find enough time to not be lazy, why don't you swing by and I can show you some sweet options for that truck? :)

Well look at that, I found the time. Mostly because I have all the time in the goddamn world.

lol..thanks for coming by dude. We'll get you some sound soon enough!

Yeah it was good to see you again, its been a loooong time!