Larger external screen in m3

[cybertoast]

Considering that the m3's navigation features are via the dongle that connects to the lcd, it should be possible to make the screen any size, and allow for greater features - possibly as an after-market product. I'd like to be able to use my m3 to look at pictures, read books, watch movies, etc. If I could buy an external screen that is larger (maybe same size as the m5 screen), I could take that along as a separate accessory to my m3. This would allow me to use the small screen for 90% of the time, and when I need to show someone pictures, or watch a film (presumably when mp2/divx support is added to the m3 :-) ), I could do so!
The external screen should not cost more than $50 tho' :-)