There are plenty of choices, but if your main concern is parts supply then (assuming you're UK based) it's probably easiest to go with a British classic such as a Mini, MGB and most things with a Triumph badge on. Which car is best for you will depend on what your total budget is and how you plan to use it - if you're moving people or things about, then a Ford Cortina might suit you, alternatively, if it's just you then an MG BGT is a good everyday driver.