As for where you can find Hajime no Ippo, try boxtorrents, they've got 2 versions up. One is the entire series + extras, and the other is only about halfway though the series.

As for where I'd rank Eyeshield 21, it's probably near the top, definately higher than PoT, but lower than Hajime no Ippo... Though if, as Budweineken suggested, you count Hikaru no Go as a sports anime, that's probably my favorite... I liked it even more than Hajime no Ippo.