For the price of 2 $200 ereaders (in case you accidentally break one) I can get a Kindle 2 with 2-year warranty that covers accidental breakage. (Okay, $424. Plus another $25 for a protective case that your cheap ereaders don't have.) So while I can believe the desire to have a $200 ereader, if your rational basis for that is primarily accidental breakage then I think you need to reconsider and get a Kindle 2.
I carry my Kindle 2 with me wherever I got.