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When I ordered the DX, I thought I wouldn't care about hyperlinking either- it would be "nice to have", but ok without it. (And I thought maybe a software upgrade would enable it.) Now, whenever I replace my dx I'm definitely going to get one that has hyperlinking. I think it really depends on the pdfs that you are reading, though- which will depend on what you're studying in graduate school.
I've found that if your pdfs are long, hyperlinking is very important. For example, I sometimes read pdfs of summer schools from arXiv. These are sort of like textbooks, and can be a few hundred pages long. To get to chapter 6, I need to go back to the table of contents (is that page 1 or page 2, or maybe there's an acknowledgements and it starts on page 4...), find Chapter 6, find the page number, remember...does the numbering start with page 1 or is there a title page, so maybe add one to that number, and then go to that page. Secondly, most of these pdfs have the equation numbers linked, so when they say "using equation 4.65 we can ...", on a computer you can click the link to go to equation 4.65, because there's no way you'll remember what that equation is. On the dx, there's no link, and of course you have no idea what page equation 4.65 is on, so you have to search, which is still pretty buggy and VERY slow. So for large pdfs, and pdfs with equation-links, I'd say get something with hyperlinks. I wish I did.
On the other hand, maybe you're studying history or something, in which case this post is totally not helpful. :-)
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