I found some fan fiction a while back that was extremely well written and I downloaded it to my kindle (which has about 1200 books on it now) and have re-read the stories several times so I thought I'd share.
The Last Warrior - by Nora
http://web.archive.org/web/200304132157 ... m/TLW.html
Full Circle - by Nora
http://web.archive.org/web/200310031407 ... ircle.html
Full Circle happens just before the last chapter of The Last Warrior if you want to read it all in order.
These are Mirai Dragon Ball Z fan fiction, lots of rich history and fun character interactions if you know the world... but you do not need to have much (or any knowledge) of the DBZ world to enjoy these stories. I would recommend copy/pasting the pages to a "word" document to make it easier... especially if you want to keep them... since the geocities site has been archived (and only these stories are currently working... if they do stop working, I can send them to you in email).
(Mirai means Future and follows the story of the older Trunks in the DBZ series after he returns to his own time)