Discussion of internal geared hubs for touring bikes?

I'm specing out a bike for use as my only bike which
will be a daily commuter as well as once or twice a
year long distance camping tour.

I'm investigating having this bike built using internal
geared hubs or some combo thereof.

Right now the only two systems I'm semi informed on are
the SRAM dual drive. see link

http://sheldonbrown.com/harris/sram.html

The other option is the totally internal Rohloff. see
link

http://www.sheldonbrown.com/harris/rohloff.html

So I'm soliciting opinions on both these system as well
as other systems I'm not aware of.