What type of performance upgrades do you mean? And are they cheap?
Thing is I don't know if I can be responsible with a fast car since this is my first car.
Personally I'd rather have the Escort or the Astra. But I don't know if they will be easy/cheap to fix.
For what it's worth I am taking a Mechanical Engineering course next year. Not as a profession, but for general usefulness.
Also I wouldn't mind an Opel Kadett Superboss. Wikipedia says they hit 168 bhp.