We started my daughter right out in the nursery. We wanted to get her off on the right track sleep wise. We decided if we kept the crib in our room it would be far too tempting to just put her in bed with us when she couldn't sleep. We didn't want that to become a habit that she kept as she got older.
We put the crib in the nursery from day one. It was hard for my wife at first, but we both knew it was the best decision for us in the long run. We didn't want to have issues later on down the line with getting our son to sleep in his own bedroom.
We had a smaller crib in our room for a few months. The nursery was just across the hall, so leaving the doors open, along with a baby monitor, allowed us to maintain separate spaces without much trouble.
With the first the crib was in our bedroom for almost a year, with the second the crib was in their room. I guess you learn a little more as each kid you are blessed with. I am thankful we never got into the toddler sized beds too, shopping for one for a grand baby now I can see how pricy they are!