What is the best/most affordable car audio equipment for the money?!?

for a $120, you will only be able to buy one of these things on your list. even a decent budget build will run at a minimum of $400-$500. if you need speakers to hold you over hit a junkyard first you might get lucky and find really nice speakers for a few bucks or just purchase the cheapest speakers possible and use those until you can save up some more money.