2002 Isuzu Rodeo curious about the appropriate cost of an overall tune up

2002 Isuzu Rodeo 77,000 miles. I am curious about the appropriate cost of an overall tune up that also includes a new timing belt, new drive belts, all new filters, flushing and replacing all fluids throughout the vehicle, fuel filter, adjustment of valves, and flushing the cooling system. This is supposed to be a very thorough preventative maintenance procedure. Is it a good idea at 77,000 miles and what would you consider a fair price?