Dash speakers

[mptoledo]

Ok, I took out the dash speakers to see what I could fit in. The drivers side really limits putting anything bigger in. I also took off my rear speaker box and the speakers are the same MFG as dash. There are 4 rear speakers(2 each side) and it looks like you can fit something bigger in there. My rear speakers are pure garbage. they sound like crap. The best buy guy says the doors are just small bass or subs. I have the fade adjusted to the front so that it sound half way decent.

Budget for speakers is around $200
summary:
1.)Front: $80 Infinity Kappa 4" (I am checking to see if 5" rounds will fit in).
2.)Door: Might leave them stock as I can here some bass from them
3.)Rear: ($120) No Idea, Please help.
4.) Head unit: JVC kd-HDR50 (already installed $165).

Any suggestions for rear would be greatly appreciated!! I would like to keep them the same brand, preferably Kappa. I like the reviews on the infinity kappas. I don't mind spending a little extra to get great sound.