How much are you willing to spend and how often will it get used?
An older car with a good spares package can be just as if not more useful as a newer model, second hand roller with no parts if you are only going to use if for one series.
Buying second hand is as you know, can be a bit risky. Ive heard a few ebay horror stories of cars not being well built or just abused
As said though, if it still have good/easy spares availability that is going to help no end if the worst happens.
The Tamiya ta05 is a good solid car which is pretty reasonably priced, even when buying new. Can be upgraded with trf shocks, carbon fibre etc etc as and when time allows too
Other variants of the ta05 like the IFS and R editions are a little pricier, but have more go faster goodies or a different suspension layout to them as standard.