I got the premium system 8 stereo and I kinda like how it sounds as it is(though one speakers is blow and another one makes strange noises).

I was thinking of putting 2 8" subs in both doors...but I have no idea what kind of speaker to put in the 4" and tweeter to balance the thing up..!!? Any recommendation ?

I wasn't planing on upgrading the rear speakers..not enough audible to make the dollar spent worth it.

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i have stock twets and stock 4" and kicker rmb8 on the bottom they are great 8" mid bass speakers. with those 6 the car sounds good

i fiberglassed the back for a custom 10" sub set up on each side but blew the subs out and now just run the speakers on the door. However i plan on putting a new sub system in. I also hope to put some infinity 5 1/4 where the 4 inches are (if they fit) and infinity refrence tweeters.

hopfully with those and the subs it should sound good. with out the weight of a box

Stock tweets with 4" Audiobahns; using the crossover that came with them.

For subs in the doors I highly recommend JL Audio 8W0's. They are the most robust sub that will fit (Nota bene: You must do some minor dremeling to remove about a 1/4" from the door hole and the bracket so the magnet will fit). They hit hard and sound great. Your other option wihout heavy modification are MTX Thunder 4500's (blew one). There may be a couple more; keep in mind you are limited to 4" depth and the magnet structure cannot be too big (e.g. Polk 8's have no chance of fitting).

I may be kind of off-track here; sorry.