Ive heard very good things about the Ian Luff Courses, so i mite give them a try sometime.
Ive done 2 driving courses, the first one i did was with Sideways Action, i thought that it was very good, teaches u all about oversteer and understeer and car control on the Eastern Creek Skidpan, pity it wasnt in my skyline since i didnt have it at the time.
And the other one i did was the Peter Finlay Car Control Course, which i didnt like very much. I did this in my skyline close to when i first got it. Pretty much the whole day we did just simple manovours and And did a little wet braking, which was just a little water sprayed onto the road. At the time i was keep to see what it was like losing control of the skyline in a controlled environment, but they didnt allow it. I dont think i took as much experience or knowledge from that day that i should have.