Time to upgrade, but to what?

I have been shooting videos for almost 4 years with the same camera, the sony HDR-SR12 but I came to the point where I want more control, more options.
The camera I'm looking for is the panasonic gh3 or black magic pocket cinema camera.
The panasonic gh3 seems very promising with its ability to record in ALL-I and 72 Mbits mov file, but the sensor size is small and the color space is quite poor. (8 bits 4:2:0)
In the other hand, the black magic pocket cinema camera is very portable, is able to interchange lenses, can record on raw files, and can record with 13 dynamic range which is incredible for its price! Again, I'm not sure how the 16 mm sensor will affect the overall image quality.
I'm well aware that coming from my sony hdr sr12 camera it will be a huge step up, but I would like to make every bucks I have worth it.
I shoot videos mainly for narrative, but for the upcoming project I will do a documentary film.
Also, how about Nikons and Canons?
Lastly my budget is 1500$, but I could wait and save money if needed.

I would suggest that you take a look at the Canon VIXIA HF G20.It has many features that rival much more expensive cameras. It's the top of the line consumer camcorder for 2013. Go here for a few reviews:

http://camera-warehouse.com/camera-photo-video/camcorders/canon-vixia-hf-g20-hd-camcorder-with-hd-cmos-pro-and-32gb-internal-flash-memory-com/