3D RPG (Third Person/First person, 360 degree looking) Camera

This is probably been causing the most trouble recently.  I've got a Javascript 3d rpg(ish) camera but its only in third person mode.  I'm currently converting it to C# and adding first person camera compatibility to it.  It's difficult due to XNA's camera control style but I think in some time I'll have it the way I want it (I hope).

3D_RPG_Camera

Of course, this means if things don't work out, I'll either be starting the camera scripting from scratch (again) or using a previously scripted camera class to base my camera class from. In the end, it won't really matter because I think it's worth the wait for getting the camera class right since everything else is usually based on the camera class and the angles in which the players view the virtual environment.