Ah geez this really reminds me of me last year haha.
Well the most important thing i think you should know is that with a cadetship, u have a job. When someone looks on your resume, they will look at your work experiences and ur achievements at a variety of levels. I personally believe that employers value such work experience much more than which university you go to. Had I NOT gotten a cadetship...and thus NOT gotten a job...it would probably be smarter for me to go to a uni with higher recognition.
So yeah...prestige is important, but with a job under your belt, u can afford to loosen up in choosing what uni u go to.
Ultimately, Macq, Sydney, UNSW, UTS and even UWS are all good enough unis to get you jobs, provided u work hard.