The ContentManager in XNA 4.0 only has one Unload() method that Unloads all Assets.
I want to have some "global" Assets that are always loaded, but then I want per-Level Assets which should be Unloaded when the level is changed.
Should I create a second Instance of the ContentManager as part of the Level.cs Class? Or should I use Game.Content and then call .Dispose on the Assets I load? Or should I create my own ContentManager on top of the ReadAsset function as outlined here?