MacOS – What utilities assist in taking and annotating screen captures for local (clipboard) reuse

Is there any Mac utility that will allow me to:

1. Take a screen shot
2. Annotate it (arrows, text, etc)
3. Upload it somewhere
4. Put a link directly to the image on my clipboard (i.e., not to some Skitch sharing page or whatever)

Or, just as good, would be a utility that puts a screen shot in my Dropbox public folder and adds the appropriate URL to my clipboard. This is what Jing used to do, but it's being discontinued and it doesn't work very well on the retina MacBook Pro.