When you decide to get another bird it would be best to get another male, color will not matter. You will need to observe quarantine rules when you get the new bird so you will need a second cage, the new bird should be housed separately for at least 30 days, and this means in a different room than your current bird. This is done so as to make sure there is no illness that the new bird might have that could be passed to your other bird. Birds are masters at hiding illness so just looking at a bird and assuming it is healthy is not a proper thing to do. How long have you had your current bird?