suggestions on a good speaker

[mikexup]

I just recently bought a standard first generation Venture that a previous owner installed a radio and speakers in. The radio is good quality but the speakers might have sounded good at one time but leave a lot to be desired now. Two questions, what is a good reasonably priced speaker to use and how difficult is the job of putting new speakers in the Ventures faring. Thanks in advance for the help and information. Mike