Although it's true that some Ami's go for quite a sum on e-bay, being in Belgium you are somewhat limited as this is probably an AZERTY model which complicates things a bit.
You should easily get more than 150 without adding anything. If you can get 200 for a bare Ami 4000/040 consider it a good sell and go for it.
I sold mine recently for 800 though it had quite a few bells and whistles
