I have just decided to go back to work full time. I haven't worked full time for 3 years now, so it's very daunting.
The biggest thing for us was the cost factor.
I'll be earning $800 p/w net, before the 50% rebate, I'll be paying about $500 in daycare for the girls. Then each quarter we'll get that rebate. So I'll have $300 a week (plus rebate) in my pocket compared to having $170 a week being a SAHM. So for us, it's better for me to be working ATM. I would love to be able to be a SAHM until the girls go to school, but that's not a reality for us at this stage.
On the plus side, I don't start work till 9.20am. Although I won't finish till 5.20pm, dh is home at 4pm.
It sounds like it's going to be more hassle than anything getting yourself and the kids ready and off to daycare/school/work only for an extra $50 a week. If it were me, I wouldn't do it for that sort of money. DH and I said that if we were at least $100 better off a week (before the rebate) than we would go ahead with me returning to work.

Sounds like you've got a lot to think about. Good luck making your decision. Let us know what you decide.