One way to make the display a little bigger on the 505 is to switch to landscape mode. In landscape mode, it will only show about 1/2 the screen at a time, but it increases the size of the page up to the landscape width.
Baz047--I don't know where you live, but if you live somewhere where you'd have access to some models of the 505 or 700, you could put your file on an SD card and try it out to see what you think.
dordale