I'm afraid I don't have a worthy suggestion on an arm at this time. In the early years, I filmed every hunt, most myself. I then stopped for a long stretch before agreeing to film a few for D&DH TV, which I self film. So, I have a bunch of junk camera arms from back then and have had a handful of others given to me over the years to try out. I'm too cheap to buy new when I have these others and they work. So I haven't tried any of the newer ones.
If you want a good prosumer cam, Cannon's VIXA G30 (think they have a G40 out now) is pretty tough to beat in my book. I film all my stuff with two of them, including the D&DH TV footage. It has a decent sized view screen, very good auto settings, solid color, decent zoom and good low light, all helpful for self filming. It's bigger than the smaller cams, but not so big that it won't fit fine in a pack. The catch is that they ding a person in a couple thousand and the couple hundred dollar cams work fine enough for most that want to film hunts for fun.
P.S. That Fourth Arrow setup looks pretty darn nice.