The ebookswise is generally a good choice, but I'm not sure about the best way to get PDFs on the device.
Rather than a PDA, I suggest the Nokia 770 which makes a great ebook reader with a better screen than any PDA you are likely to get for ~$100. It has a color LCD screen, and you would have to pay attention to screen brightness to reduce eye strain.
Note that if by "PDF ebooks" you mean Secure Adobe PDF ebooks (readable only by Adobe Reader 7 or Adobe Digital Editions), then these are not typically readable on any inexpensive device. Standard PDFs are readable using pan and zoom on the 770, or if they are primarily text they can be converted to a reflowable format. I would use Windows MobiPocket Reader to convert such PDFs to MOBI for the 770.
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