Which front-speakers between 5.25 and 6.5 will fit properly?

[Pokarface7]

I drive an Aveo LS 2004. I found out here that the stock speaker are 4", however, some of you have installed 5.25 and 6.5" Speakers. Which speakers do you think will not interfere with the windows and give me the best sound and costs around $50-100/pair? Do you think I should go ahead and get 5.25/6.5 or just buy 4"? If the front doors' speaker panels are just 4.5" would playing bigger speaker 'bounce' back the sound?

I have read that the difficulty(not really difficulty but I don't know a better word) in installing the speakers from easiest to hardest is as follows:

4"
5.25"
6.5"