You can make your own frozen dinners, and have more control over the choices and combinations. Save the plastic nukeable trays the store-bought ones come in, (not the carboard ones, since they aren't washable) or buy microwave-safe containers.
The trick is in having about the same amount of each food item in each compartment, for even cooking. Keep in mind that potatoes don't freeze very well in home freezers, but you can easily substitute cooked rice or pasta.