^ Finish HSC in my opinion
As in this day and age it is getting harder and harder to get a job without a HSC wether you get an ATAR or not....
It doesn't matter if you do non atar subjects but you will still get your HSC ( Which will help greatly with employment )
I am aiming for high 90's in my HSC ( Starting in 2 weeks ) but even if i get my desired mark and get into the course at Sydney Uni i am going to take a year off travel a bit and get a full time job, Although i have had jobs since i was 12 currently holding 3 jobs. I would personally like to get out into the workplace / workforce and get a handle on it all before entering a 4 year Economics course. ( Even if its 1 year full time Of Becoming a manager of mcdonalds.
( If your contemplating Going into a business related course ) mcdonalds can be good if you dont like school as if you become a manager at macca's you actually get a business degree and can go into uni from that degree obtained through mcdonalds. ( Im not personally aiming for this but ye )
Also That 1 year all dat $$$$ and no outgoings = MODS
But seriously consider staying at school and getting a HSC ( Not an atar just the HSC ) or even so Get the HSC at tafe