coming from a low risk country and being in Australia at the time of application don't really affect the allocation time, the visa type does.
If you applied for the on-shore 885, you will get a CO within 4 weeks, however if you applied 175, I do not think you will get a CO within 4 weeks as they are currently processing applications from May and June 2011, therefore at least few months before they can get to Feb 2012

If you applied for the on-shore 885, you will get a CO within 4 weeks, however if you applied 175, I do not think you will get a CO within 4 weeks as they are currently processing applications from May and June 2011, therefore at least few months before they can get to Feb 2012