He would be able to beat:
Hidan-the most inexperienced of Akatsuki, and he would never be able to get Jiraiya's blood because he's not as fast or smart and he just runs into everything
Deidara-the youngest of the Akatsuki, who, like Hidan, runs into everything, so he would be no match for Jiraiya
Kakuzu-this would be hard for jiraiya, but although Kakuzu is pretty smart, he is easily tricked and Jiraiya could kill him in Sage mode
Kisame-he can be beaten by taijutsu and jiraiya is too fast in sage mode, plus he can beat him in shark mode with Sage mode
Sasori-I think Jiraiya would be able to avoid the poison with speed, and Sakura and an old woman were able to beat him, so I think one of the legendary sannin can too.
Konan-as we saw, Jiraiya can just drench her in oil and then bye-bye konan
People who could beat Jiraiya
Itachi-I think Itachi's intelligence overpowers Jiraiya's and he has amaterasu, tskyomi, and susano'o, and I don't think Jiraiya can take that
Madara-he's too fast and he has a bunch of unknown powers
Pein-obviously we saw this
Kabuto-I think the edo tensei could destroy jiraiya, he has too many of them
Orochimaru-i think they'd be pretty even here because they are both sannin, and we never got to see orochimaru full strength in shippuden, and even then he took on the 4-tailed naruto that almost killed Jiraiya.