Indeed, I just noticed the $780 Weapon Lemo Adaptor Collection.
You'll also need a $220-$240 LCD Cable to go with the Red Touch 4.7" that may or may not start shipping in early 2016. Unless the touchscreen directly connects to the camera without a cable.
I have heard that the NTG-2 is a "quiet" microphone, so you need a good preamp/mixer or you'll get a lot of noise. I believe the Tascam DR-70D preamps are a lot better than the DR-40. I use the DR-40 with the original Sound Devices MixPre (not MixPre-D) with a "quiet" microphone and I get good results since the MixPre has excellent preamps.
The DR-70D is probably the best choice as far as preamps go, especially if you buy the NTG-2.
My shotgun microphone has similar specs to the AT875R. You'll be happy with it. It's cheaper, smaller and lighter than the ones that take batteries. You'll have a recorder with phantom power anyways with the Tascam DR-40 or Tascam DR-70D.
What frustrates me about the Blackmagic Video Assist is that it doesn't have a 1/8" audio in jack. So, you're stuck with whatever audio is embedded in the HDMI or SDI stream. I think that was a big mistake on Blackmagic's part.
I would budget the following:
$250 APS-C camera (T2i with magic lantern anybody? Check out Kendy Ty.)
$400 fast prime lens(es) (50mm F1.8, 24mm F2.8, etc.)
$700 audio solution (mic, pre-amp, recorder, boom pole, stand, cables, headphones)
$100 camera support (tripod and/or shoulder)
$200 fluorescent lighting kit (or if using natural lighting, spend more on lenses or sound)
$350 misc. accessories (SD cards, ND filters, chargers, batteries, LCD viewfinder, adapters, cables, etc.)
Yes, spend more on audio. It will hold its value through years of camera upgrades. Buy a cheap used camera. Get used to manual focus and shallow depth of field. All of this gear adds up quickly, so stick to your budget in the different categories. I work at a production company where I have access to Arri Alexa, Red Epic MX, Sony A7s, Blackmagic Production Camera, 1D Mark IV, MoVI M10, Kessler CineDrive, GoPro, Arri Ultraprimes, tons of Canon L glass, etc. I've used them all except the Alexa, which we just bought.
I shoot on a used Canon 60D with Magic Lantern. I can borrow the other stuff for free if I want, but it's so much better having your own cheap camera to play around with.
People who spend too much on their camera become "camera poor." The good thing about buying a used camera that is over five years old is they are cheap, highly supported with forums and tutorials, have cheap third-party accessories, etc. Remember, everything you buy that is not camera-specific is more future-proof. So, sound, lighting, supports, some lenses, and some accessories will work with future cameras when you decide to upgrade. Focus on investing in those areas.
$450 can get you the camera, 50mm F1.8 lens and an SD card to be able to shoot with the bare minimum. You'll know what else you need to buy after a bit of time playing with it.