Good cross hairs
World of Tanks has a good cross hair by default. Of course, you'll want to customize it a bit but generally, most new players are happy with it.
Sometime, the best crosshair is simply "a dot surrounded by a small 90% alpha circle outlined by a 50% alpha edge."
However, if you could allow people to create their own custom crosshair, that would make everything that much more unique.
Composer
www.reverbnation.com/theflowwithin
