I think accessories are very much an individual thing – I have the ultimate which is pretty much fully loaded.
I bought an organiser that fits on the rear of the back seat – for items I use regularly – I also have an electric pump that allows you to set a value and then inflate deflate tyres – I have trouble bending down so I move car so valve is at the top – the only item I have that will stay with the car are wind deflectors – see top of this page.
I think there is prob a case of living with the car for a week or so and you will discover what will work best for you – I definitely find the items mentioned useful.
Enjoy your car?