Been looking at gearhub and I think it is worth to give it a try. User opinions/reviews are a bit discouraging due to malfunctions or short lifetime.
From what I've heard the rohloff's are more reliable than the wheel? I think shimano has an 11 speed gear hub available which is supposed to be much better than their earlier options.
The newer 8sp nexus hubs have much of the 11 sp internals and are meant to have the same sort reliability. The rohloff is the daddy though. If I ever have 5-700 quid to drop on a gear train upgrade that it will be mine.
It's also worth noting that most of these hubs have far more range than the OP needs.
Current Bikes - Dekerf Team SST
, 98 Birdy Blue, 93 Orange Prestige, 93 Vit T
, Dropbar Pace RC200 F7
Gone :'00 Orange Mr XC
, Dekerf Mountain
WANTED : ** Orange spotty shorts **