Telescope Upgrade questions.?

I would say $200 on your old setup. You are thinking about upgrading from a 4" to a 5" scope. Personally, I would go for a 6" if you really want more light gathering ability where you can really see a difference. Even if it means waiting another month or two to save the extra$$$$. You will then have a scope that can be resold easier if you decide to go bigger eventually. a 4 or 5" scope is harder to resell. Meade makes nice products.