If you can find a queen, many people re-queen in Fall. If you can't, you will need to wait. In my experience, a full working hive is way more agressive than a new package hive during the first few months. However, I have some that are more aggressive than others as well. I have 2 agressive hives (out of
and they produce well and are able to defend themselves, so you need to decide what level of aggressiveness you can live with. I sometimes use mine for splits and different experiments because I really don't care if I lose them, and it is nice to knock them back a little by splitting or taking frames.