watch some of this persons wedding videos and take out how they blocked the story and what audio is playing in the background. Many times I use their card reading/ speeches/ vows for the story and lay over b-roll. Now thats watering it down quite a bit, but the most important thing is to keep in mind is to capture audio. Without audio of the groom giving his vows or the best man telling his speech it'll be hard to create a wedding film with a strong story.
For the best image get the G7. Its harder to use but the end result is gang be the best.
The Canon T5i is the most stable, and has the most lens selection. Its the easiest to use but you will have limitations down the road.
The Panasonic GH2 you can hack and also get a good result but its going to be more complicated than the Canon t5i.
I would say that buying a used Sony a7s would be your best route. It has great low light, a great overall image, and you can adapt almost any lens to it with an inexpensive adapter. Also you can always rent a Atomos and get 4k if you need that for your short film. You also have great functions like focus peaking and S-log if thats something your looking for.
Canons are good, but in the past few years they have been slacking on their video functions, and if your looking for the best bang for your buck for a DSLR for video, Sony would be the best way to go on your budget.
also I picked up a set of canon FD lens, Rokinon 85mm, and a canon 70-300 USM.
Sorry for the late response, but I ended up getting the sony a7s for an even better price at 1200. I did this purchase because, in all honesty, it rejuvenated my interest in filmmaking and in a way started to force me to make more films to justify the purchase. In the end I also ended up getting an extremely good deal on some LED lighting panes (with a different purchase) therefore completing my kit!
definitely enjoy this type of content, super helpful. Thank you for sharing!