It seems that the only touchscreen monitors around now are 4:3 aspect ratio and very low resolution, made for Point of Sale application. Why hasn't anyone made a high resolution touchscreen for designers and developers who want to be ready for Windows 8?
In a low res screen your "touch" covers less pixels and in theory is a bit more accurate than a high res screen where you touch more pixels. Its a terrible way to describe it, but I am not sure how else to right now :P
Realistically I will keep my desktop as-is for its purposes and invest in a tablet for media consumption this fall.
If you look here, Microsoft has already approved some specified screen sizes with touch topping out at 27" 2560 x 1440 which is fantastic