If you are talking about the lower half of the Market; most of those buyers are looking for a turn-key house; they are fully invested by the time they put the down payment and closing and moving costs.
They don't have money left over for frivolties such as a new stove or refrigerator, much less a kitchen re-do.
If you are talking about the upper half; I would say that the Kitchen would be number one: In the last few years, we have seen terrific advances in appliances, solid surfaces and amenities.
Bathrooms would be next.
And yes, since we do so much living in the back yard, they want a nice living/entertaining area.
A new A/C has become one of the most important features, not only because the cooling is so much better, but the new units are about 150-200% more ecconomical.
Solar would be next on the list.
Good luck and may God bless