IME, a pair is harder to deal with in a community. I have done it successfully, but it is still harder. I often hear people advice to get paired angels, but I personally have not always found that to be the best option. They can get downright nasty when protecting eggs. If you do a pair, I would remove the eggs when they are laid inorder to curb aggression. However, like I said, sometimes pairs can work in a comminuty too. Your best bet seems, IMO, to be to still get a handful of juvies and see who seems to get along with whom the most peacefully. Remember that aggression issues will likely intensify as the angels get continually bigger.