As for the replacement a large fillins, lets not get cynical, a cerec type crown/inlay is a way better bet than a large composite, those dang things can leak after no time at all on a big baby cuz they're more brittle than my Aunt Dolly's hair and cause way worse prollems down the road when they start crackin up and y'all don't even know.
Sometimes y'all really get what ya pay for.