Checked my bees: The hive that did NOT die of idiot-induced dysentery is doing very well indeed. They are all busy on the top though... should I still reverse the deeps? Do I want the cluster on the top or bottom during the spring?

Also, I want to purchase a queen and give my other hives some bees to get up and running. Since I haven't done it before, when is it safe to divvy up my bees without weakening the original hive too much?