Go with something popular that you can get spares and help for.
Used Xrays (T4'14 or later) are always a good shout; the setup and spares are pretty much identical to the latest cars. You'll usually pay more than other brands initially, but spend less in the long run as the quality is excellent.
Mi6 is also popular, so you shouldn't have an issue getting parts and setup. The build quality (fit and finish) isn't on a par with Xray, but it is strong.
Get a car with a carbon chassis, as that's the only option for outdoors, and best option indoors with club-level grip.
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