Not worth it, turbo's are much better than superchargers.
Define better? supercharger has no lag, smoother delivery of power, and has that fantastic whine when going for it. The only advantage I can see of a turbo is that it doesn't use as much power to turn the turbine, because it uses exhaust gasses. But instead you get lag.
The guy that owns storm had a mk2 golf and supercharged it to 450bhp. it had so much power that it twisted the chassis and wrote his car off.
I'd been considering chatting to them about this for the Cordoba at a later stage, but now I'll stay away I think. That sort of bull might impress some people but to me it just says find another tuner...