Just to add some feedback about my experience with the Sony covers. Originally I bought the 350 with the pink cover without light. After a while I realised two things, firstly the screen was too small, and secondly, I much prefer reading with the reader naked (as I always did with my old 300). Although the cover was nicely made, fitted well etc. I just didn't like the experience - I'm not one of those people who want their reader to be more like a "real book", I am happy with a Star Trek like screen.
My solution was to sell the 350 and cover and buy a 650 with the pink/mauve Sony zipped case. Having done a lot of reading over the past few weeks, I am very happy with this solution.
The final touch was to fit a Decalgirl skin, see pictures below - hopefully as I'm not sure how to do this. If it doesn't work, you can see the album saved with my ID.
I hope you enjoy your reader when it arrives and that you find the right cover for you.
