Problem with Sony for that amount of cash is the lack of ePub support. This is why I bought iReader Smart. The biggest nuisance with iReader is the Chinese only interface.
I understand that this might be a problem for some people. But I actually prefer to use my Kindle to read e-books. I actually like the rather minimalistic approach the DPT-RP1 has. It does one thing, and it does it great (for me at least).
Callibre has a decent EPUB->PDF converter
i hadn't heard of this one before. do you have a link with more info? where did you purchase from?