Hey there.
With the regular Kindle you can make the font size really very big. The display is just like paper, pretty much, but you can happily tilt and twist it whatever way you want.
An option you might want to look at maybe, is a Kindle DX, to have the bigger fonts while not pushing a lot of text off of the page.
I don't see why you'd have trouble reading the Kindle, as long as you have the room well lit, and you can read a computer screen fine.