87 gn t-top car with 6-speeker concert sound

[BMFBUICK]

I would like to replace front dash &door speakers &rear 4x10s I would like to put 6x9s in rear but i dont know what to buy i don't won't to spend a lot just something to make enough sound going down the highway at 80 mph with the tops out. please give me some part# I would like to order tomorrow from crutchfield or go to bestbuy. I have a pioneer cd player about 2 years old that I replasted the factory delco with i do not won't to cut rear deck lid any speaker replacement #s would be great