Well, 5x7 wont give as good of a sound as a circular speaker will and will distort quicker, but i know that isn't what you are asking. 5x7's can still sound pretty darn good. I would go with the MB Quart 5x7's from carstereotime.com, they are only $75 shipped! This is probably going to be the best speaker for the money. You might also want to consider cutting out the rear doors and using 6x9's if you want more bass, but thats a lot of work, considering the 5x7's will just drop right in.