Why cant they just have a standard and save us all the hassle

lol.
Alot of my ebooks are in txt's, htmls and pdf's. the html's and pdf's i copy pasted and fixed into txt's to then convert into epub or lrf onto my sony. does the kindle display txt's well?
Im really not picky. i dont mind having little page number breaks and stuff. I just hate large fonts and having to flip pages every 2 seconds. As long as spacing is good and no wierd glitches im fine