I know, I went through all of this years ago.
to those playing with the calculators: keep in mind when you use the c/link calculators that when you are estimating your single parenting payments you have to put your 'income' as your $14k (or whatever it is) PPS payments you would theoretically be receiving. A lot get caught out this way - they put $0 as income which makes the amount look higher than you would realistically receive.
ETA: also keeping in mind that while you lose some benefits such as full CCB etc some expenses are halved such as rent, electric, etc. No longer two lots of housing and expenses relating to that to pay.