I got a 8S for a rc10T2, i was thinking about the lehner as well, but i got the 8S.
they are pretty simular in performance. the the lehner though, has got a screwed endbell, and the 8S takes the rc-monster heatsink/clamp to keep in one piece. (not that it will fall apart that easy, but it's nice to add a little safety, and it keeps the 8S running cooler as well.)