When it comes to disc-brake hub gears, Shimano Alfine is probably best for everyday commuting . The Rohloff 14 gear is much stronger and more durable with a wider gear range but it is 3x the price. I have used my Alfine on a Dahon Cadenza 8 for 1 1/2 years with no problems.
Good Alfine bikes include
Giant Seek 0
Merida s-presso i8
Kona Dr Fine
Avoid bikes using a sprung chain tensioner (like a rear derailleur)
make sure the bike has eyelets for rack and mudguards
Be aware that standard rear disc mounting can interfere with rack and mudguard fitting. Chainstay disc mounts are out of the way.