I am one of the people who have had ussues with FLyaways, etc.
I don't regret the phantom purchase.
If I had it to do again, and I have some skill in RC, I would most likely go with something like the DJI F550, with the NAZA controller and GPS. Essentially the same device, but capable of heavier equipment - camera, gimbal, etc. You will need a radio how ever.
The thing with the Phantom is it comes assembled, and is suppose to work out of the box. For the most part, that is correct. The thing is, none of us are flying it out of the box.
You can't use the GoPro mount that comes with the Phantom unless you are only going to take pictures. It is not isolated from the vibration of the blades, etc enough to do video. SO, you will end up buying at least something that isolates the camera. That's an additional $30 - $800 depending on what you choose.
Many of us have changed to a different propeller, and we have learned to balance the propellers. That is key to getting good control and reducing vibration. You can add another $30 - $100 for those.
These gimbals, well they are not designed to work with the landing gear that comes with the phantom. So, you will look at either something that extends the gear, or buying new landing gear or even more extreme options.
I'm not trying to dissuade you. What I am saying is, if you have some skills and the desire to build your own, you might be better off with something larger like the F550, landing gear, better battery, better props, and an inexpensive radio. It will cost the same amount.
Having said all that, I just ordered new ESC's and motor for my Phantom because one is damaged or is worn out. So, I didn't take my own advice and order something larger, which I am still considering.
Darren