Thank God an anime as great and long as Hajime no Ippo exists. It's perfect for me right now - straightforward and simple enough not to require rewatching and exciting enough to marathon. I watched 1-13 of the currently airing second series yesterday, and I'd wacched the movie before that!!!
The second series better not end at 25/26. Under half of the 850 released chapters (I thought Naruto was long!) have been covered in the anime so far, so it'd be silly to stop. I'd love to watch Hajime weekly once I hit 18/19 for a lengthy period; like I used to with Bleach and Naruto.
An example of Hajime's greatness: