TD04 Will provide more than enough power for what you need. You might gain more power at the top end, but the TD04 will give you a better spread of usable power. A quick car isnt necessarily the most powerful.
It varies between what you have. There's a guy called Chris at the worksop branch. Only ever let him do my tracking/alignment. Starlet should be about £30-50 depending on whether its just tracking or camber setup etc.
I'm always wary about bidding on a car before seeing it. I did it before and it turned out to be a right lemon haha. If I'd viewed the car id have probably gone higher haha
Its a shame Imprezas have such a deep offset otherwise it opens up another world of wheels. Some nice Speedline Safari's in gold would suit it perfectly.