As always the BIG question is - what you're planning to shoot? Canon used to be a "standard", now more and more people migrating to Sony with A7S and more high end stuff. Also it used to be that you choose brand and stay with it(like me with Canon), but now everybody mixes everything with adapters depending on your needs. You can create your own system based on what you shooting yourself on the lower end and if big job comes around you can always rent. Since you've mentioned doc in Cambodia, I can tell you what I use for similar stuff...
I worked with NGO's in Africa for the last 2 years shooting short docs all on Canon t3i. All for the web. Got tired of dealing with it's limitations and carrying extra sound gear and such. Now have Sony PXW-X70 which works fine for all my personal work and some clients. It's also have lot's of limitations, there is no cameras for every job. I use Sony for 90% of my work and when I need shallow DOF or wider lens, I use my t3i. Other guys before mentioned other setups. Personally, right now, I would limit my investments in any cameras, because they are getting better and better(and outdated quickly). Sony A7S is $3000 with adapter - is more than a year old. Great camera, but... Canon C100 original, great image, but too old and other problems, enough said already. C100 Mark II - $5500 great image, no broadcast codec, no 4K(personally don't care). I repeat $5500! If you lucky to have that much cash to spend on camera for maybe 2 years of use, go ahead. And don't forget, no pro will go to a job with one camera, anything can happen... Otherwise buy cheapest camera you can, for the quality you need, right now... And spend the rest of your cash on producing and shooting more films.

Funny that it took so long. I was doing it with DIY extendable leg and set of super clamps for a few years now.

Go with Sony FS7. I rented it for a few days loved it. Not for the stuff I do, but excellent camera for big docs and narrative in 10k range.

I shot docs with T3i(same sensor) in Africa for 2 years and footage from camera is soft, but can be sharpen in post to satisfactory result, especially for the web. Lens quality is important, I use Canon L. Now I switched to Sony PXW-X70 and you can see huge difference in sharpness, X70 is so much sharper. Still T2i is very capable camera, a lot of really good stuff was produced with it. Unless you can go for a significant upgrade of camera body with GH4 and high, your money better spend on accessories.

Get a boring job like night security. Shoot your own projects during the day, do post at night. Then if you get good skills, maybe... :)

Here is some info you might use: http://www.ofcom.org.uk/static/archive/itc/itc_publications/codes_guidan...