I'd go for the Via out of that bunch. If you do want an internal gear bike, they have a 3-speed model too: http://www.giant-bicycles.com/en-us/...5930/#overview

For internal vs derailleurs... I've never had a problem with derailleur bikes. They do need more frequent maintenance than internal gears, but it's not that much work; maybe once a year tuneup if you ride regularly? Unless you're putting it through harsh conditions it'll hold up just fine. However it does mean you can't use a full chain guard, so you'll have to be careful to roll up your pants leg when you ride