Two other of our divisions of electronic babble - pardon me, I meant social media - have probably apprised you of the contents of this post but here goes anyway: Canon Australia are giving out double cashbacks now. Theres a few rules you follow but they are simple:
The cashbacks range from $ 50 to $ 200 on selected Canon Cameras. That's a given and worth while in itself. They go until the 24th of December, 2015.
IF you then buy $ 200 or more of Canon products in the same transaction ( and this does NOT work with buying the lens os a standard kit...) then you double that camera cashback.
Essentially, you want to look at getting another lens to complement the kit ones, or a flash, or batteries and a lenshood or a battery grip, etc. to activate the double cashback.
My choice would be a flash. The 430EXII is probably my favourite though I can see the advantages of the 600 EX RT for some users. All the Canon flashes work like steam trains anyway so you really can't go wrong there.
Or get one more lens - a portrait one or a close-up one. Whatever - you can't go wrong with a prime lens from Canon on any of the bodies, as long as you remember to get the right one for the sensor size.
'Scuse me - time for a coffee...
