I'm thinking of getting a Fender Champion 600 sometime and a lot of people say change the speaker. ((6.5 inch speaker isn't as good as a 8 inch...duh((?)))) So in general, what is the best possible 8 inch speaker that would go well with that amp??
Try and find something that matches the amplifiers impedance (4ohm). Jensen's CR84 seems to do that and is also recommended for what you're trying to do so I suggest giving that a go.