Legandary Map Pack

Just yesterday I got myself and a little help of my dad loaning me money I just bought a 1600 Microsoft points card. Which will let me get a Halo 3 background and the Legendary Map Pack. This map pack will allow me to have now officially every Halo 3 map/map pack that is out now. And the other good thing is that I have 990 achievement points in Halo 3, and now I will be sure to get some more achievement points since some of the achievements can only be given on Legendary maps!