I have another thread with a Dual leech ring with 11 all res, i'll leave it off this thread for simplicity. My other rare rings are:

Ring #1
6min dmg
130AR
8% LL
1mana after kill
8max stam
3light radius

RIng#2
10FCR
3dex
2energy
24mana
3allres
11fr

Ring#3
10FCR
7% LL
15AR
20life
3all res
20lr

Ring#4
19str
18mana
24fr
6min
11AR
chance to cast chain lightning

I think #1 and #3 are worth something, the others might just fit someone's needs. I was offered 5hrs on #1 but that fell through, so there is currently no T/O on any rings.