Welcome aboard, 5hifty.
I know this may sound defeatist with you being new to the forums but my opinions on this come from experience of using CSCs and DSLRs from the lower end of the market so I apologise if what I say comes across as harsh.
For clear video quality at that price, I think you need to set realistic expectations, especially when looking at low light video work since the two things you're looking for tend to be mutually exclusive.
You would probably only get the kit lens (with the body) at that price, which isn't an especially fast one, particularly if you zoom in. In low light, your autofocus will suffer since you may not have adequate contrast to autofocus quickly and accurately so you may have to ramp up your ISO to compensate for the low light but this will of course compromise the quality of the video - past ISO 400/800, grain will be noticeable. If you look around enough, you could get an LED video light for $20-30 but it'd only be so bright for that money. With that said, it ought to help improve the quality since you wouldn't necessarily have to increase the ISO as much depending on how far you have the light from the subject.
I think it's standard when buying it as a boxed bundle but if you go down the route of the Canon SL1, I suggest ensuring that the STM version of the 18-55mm lens is included. The older generation 18-55mm kit lens uses the DC motors which are both slow to focus and noisy so if you see a deal for a used SL1 with a lens, it's probably worth clarifying which version of the 18-55mm lens is included.
DSLRs: Canon EOS 7D Mark II, Canon EOS 70D
CSC: Canon EOS M3
Lenses: Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF 100-400mm f/4.5-5.6L IS USM, Canon EF-M 18-55mm f/3.5-5.6 IS STM, Canon EF-M 22mm f/2.0 STM