With a 2500 budget here's what I would do:
- Canon EOS 70D w/ 18-135 STM Lens: $1549
- Lilliput 569 O/P External Monitor: $260
- Ravelli 67-inch Adjustable Fluid Head Tripod: $90
- EzFoto Follow Focus/Rails: $279
- Rokinon 35mm T1.5 Cinema Prime: 499
These are all new prices and total 2677 but there you have a complete set up and one you can expand on. The 70D is an outstanding video DSLR and will make me hard pressed to reach for a traditional video camera again. Buy a shoulder rig or something and you've got a great set up when paired with the 18-135 lens - smooth autofocus, it's great.
The next four items are more traditional for video, but very helpful. The Lilliput 569 is a great external monitor at a great price. It offers peaking which helps you know whether you're in focus or not and runs on a standard LP-E6 battery (same as the higher-end Canons). The Ravelli Fluid head is a nice fluid head tripod at a nice price. The follow focus and rails are an investment for the future, but make shooting video using traditional EF mount lenses a whole lot easier as it adds a gear belt so you can easily adjust focus. Finally, the Rokinon cinema prime lenses are wonderful for video - you can adjust exposure smoothly (no clicking and noise) and they come pre-geared. Plus, they're pretty cheap to expand the collection.
Probably not what you're looking for it's a heck of a setup that is very expandable and versatile.