do you guys recommend any particular speakers (name brand, 3 way , 2 way etc.) and place to get a good deal on them, i looked on ebay it seem they have good prices

and any difference in getting 6" 1/2 or 5" 1/4, does size make a difference in this aspect, =)

 

On speaker size, you need to buy what fits. I am not sure what size the max takes. If you can't install them yourself, you should consider buying locally, and having them professionally installed.