As Paulus said with flight that size you will have no prob housing most breeds together,you could also add redpoll,siskin,linnet, as long as they are aviary bred rung.With the foreign i would stick with the zebras and bengalese as these are the hardiest,others are very sensitive to cold and sometimes hard to climatise... owls,gouldians ..etc,and with the price the rarer foreign species are making it can become very expensive hobby especially if there dropping dead due to cold and stress. Another factor you will have to think of is if you will be planning on breeding come spring,if so you will