80k for 4 people is cutting it very close in Toronto. If by "decent lifestyle" you mean living downtown with short commutes in a nice, new, 2 bedroom condo with parking (and having a car to do weekend trips), being able to go out for dinner and/or cinema at least once a week and still be able to put money into savings you'll have a very hard time. Don't think that'd be possible. You'll have to make compromises in one or the other area.
For example getting a place in Scarborough and having a longer commute if you want to go downtown, not having a car, not going for a new condo, but a basement apartment etc.