@DueCore,
OtterBooks is right. If you save a bit, you can get something you will really use at full capacity! I've taken several certifications, but usually they have lot of tables and graphics, so not so sure the reason for your comment.
Converting PDFs to other formats is not so easy because PDFs use vector images and has not been designed as a regular text document. Any attempt to extract or convert that result in different layout or alignment, it is horrible, trust me on that.
If you really have budget restrictions and can't wait, Kindle 3 wifi has built in PDF support. You can use it landscape and even zoom in, but screen is not so big like a regular tablet or Kindle DX. I like it though; I read some Oracle PDF books on my Kindle 3 and looks ok., just kind of small. However, I use my Kindle DX for such kind of documents and the Kindle 3 for novels, fiction and cybercrime books
