If thats your budget then yes, those brands or one of the Ultrex/STechnic exhausts will do the job too.
If you want to un-hairdresser the stock Betty hatch then I would say try to get yourself an STi wing for it, lower it, fix the bodyroll/understeer, and I know the flamethrower will come for this, but a good set of mudflaps and some nice wheels wont hurt either