advice on buying my first cerbera

[high flyer]

Hi. I am new to TVR and i'm wanting to buy my first Cerbera, I have 20K to spend and i'm relly after a 4.5 if i can. Any one there who can advise me on where to go, buy trade or private and most importantly do I need to budget for high maintenance cost as so many none TVR owners keep telling me. Appreciate your help.