My first choice would be to buy an iPad as I have an iPhone since 2009 and now need to upgrade it. Besides an iPad, what else is there that can display PDFs? I don't want to get into a whole iOS/Android debate as I'm just wanting something that can view Jpod PDFs correctly.
Virtually all modern tablet devices will be able to render PDF on-screen. Personally, I'm more lenient towards Android. However, if iPad is your cup of tea, go with it. Also, you can purchase Surface tablets which have Windows loaded on them. Surface-like tablets are full-feature computers in tablet form, which can be cool. Though, it all boils down to preference. If you've had a great track record with iOS, stick with it.
Sheegoth are large predatory creatures native to the frigid Phendrana Drifts region of Tallon IV from Metroid Prime.