Best portable headphones and DAC

The operative word is PORTABLE.  I like my current set-up (which consists of an AQ red dragonfly and a folding pair of sennheiser headphones.) but I,m wondering if there is anything better out there.  I also have a chord mojo but I,m not sure I would categorize that as portable.  It mAy be fine for taking on a flights but it's too heavy for walks or bringing to a health club , IMO.  I'm debating about upgrading the dragonfly to "cobalt".  The reviews are mixed as to whether it's worth it if you already own the "red".