Awww hell yeah! just got a '92 vert :ylsuper but the stock speakers are crap. I went by Best buy to see what was possible and they told me 4x6's for front and back

I'm sorry but I just picked up a Sony CDXM8800 for this baby and I'm not gonna run it through those cheesy speakers.
Can anyone offer suggestions for what is possible while keeping things stock?:help