Hey Guys, just found this thread cause I have been interested in trying the Tricopter route. I currently have two quads, a TBS FPV Disco with Naza+GPS and a TalonV2 with a Quadrino+GPS. I also have the ArduPilot Mega 2.5 in an FPV Penguin (Plane). I think the AP Mega board is the best deal out there for the money so my next project I think will be a Tri with this board.
On the vibration thing I have a permanent solution, balance the motors
(yes, and the props). It's easy to do and I can get a motor done now in about ten minutes. Here is a "How-To" page I put together on my Wiki and be sure to look all the way through as I put in a short-cut if you are less nerdy or just impatient
If you balance your motors and props completely you may be amazed at how quiet your ship gets and you will have no jello.
Also, if you are interested, I've done some prop comparisons on my bench tester including the new 10x4 GemFan woody. (I'm a fan of the Graups myself)
On the GoPro, I run the Hero2 and have found that indeed, brighter sun seems to amplify jello which is why I decided to figure out how to kill the vibration in the first place. I also found that if I am watching video primarily on a computer, 720P x 60FPS is just as cleen, if not cleaner, than 1080P x 30FPS. This is because the 60FPS setting has a wider view which serves to smooth it all out. If you are streaming to a big screen, 1080P has a slight edge but for me that is rare.