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Concept 300 is no longer made/sold. Nearest replacement would be a Concept 650, which has everything the C300 had plud dual zone prox and Black Jax. Or something like the Sigma S30 is a basic reliable alarm.
Sigma if you want something that will work first time and everytime, Clifford if you want something a bit more fancy with more features but dont mind the possibility of having to take it back a couple of times to get things adjusted, DEPENDING on who fits it and how well. If done well then you shouldn't need to at all.