I tried a creative/filmmaker path for a career, I can tell you it does NOT pay, which is why I'm here with an online video startup try-out. I've shot 30: spots on 16 and 35mm for about $6k, with anyone barely making $100 a day. I can tell that for a demo video of just about any type, in the digital age, a budget of around $30k is solid.
Obviously I havent seen the script, but a good way to judge whats required is for you to point out what you'd want your production value to look like by linking to videos that you would want yours to look like, and by declaring what you have available to spend on it.
I can tell you that the "exchange for equity" works great for 19 year old kids on craigslist who will use their iphone because they're looking to build their experience and reel. Obviously if you're pitching to professional investors, if your video looks like a random cheap youtube video then you will be treated as such as thanked for your time and shown the door because you're obviously not taking yourself seriously.
tl;dr - Get $20 to $30k and you'll be able to shoot just about any demo video you want, possibly even variants. Dunno about cities but that's what would work here in Los Angeles. There is one company that MIGHT do a video for you in exchange for equity, provided its up their alley: http://www.theverge.com/video/2014/12/2/7319073/the-startup-that-makes-your-startup-look-cool