Alright im ready to upgrade my stock 7 speaker infinity system but im gunna take it step by step. First thing i wanna do is just a plain speaker swap! Now i know stock sizes are 6x9 in front and the rears will take a 6.5 speaker but can i do 6.5's in the front and rear or should i stick to 6x9s in front? Im going with Kicker speakers! Can someone suggest a model over another? Thanks guys!