Lightning Riders

I am considering to switch from the 3*9 Shimano Deore to any internal gear hub.

Any experiences or thoughts on
- Rohloff Speedhub 500/14
see http://www.rohloff.de/index.php?id=21&L=1
or
- SRAM
http://www.sram-imotion.com/us/html/navigation_us.html
DualDrive II
i-motion 3
or
any other?

Which versions in particular would be the optimal fit for the Phantom (dropout etc.)?