Questions about buying a cerbera

[Mark300zx]

Hi,

I am interested in buying a cerberra, but I ony have 15K and want to know which model I can afford and which models to avoid! Also if I had a bit more cash would there be any more desirable models to purchase?

Is there any truth to the rumour that if an engine rebuild is required, it has to go to a main dealer/blackpool?

Mark