I would say C920 is best for a budget, that 550 conference cam looks great though. Something a lot of people don't think about that is very handy is a tripod, this one is cheap and fantastic:
https://www.amazon.com/AmazonBasics-...+basics+tripod
You also want to get around 500 watts of light on your model, unless you are in one of those rare situations where you can use direct sunilight. This will increase the image quality from any camera, Amazon has some great lighting kits like this one for almost any budget:
https://www.amazon.com/Neewer-Profes...ting+kit&psc=1
For toys the Ohmibod is really hot right now, especially on chaturbate and MFC, it vibrates when customers tip and they get into kind of a feeding frenzy "making it rain" which is lots of fun for the model.