IMHO, it isn't a good idea to use your personal device on BES. If the company is paying the freight and providing the device, they generally have a good reason for doing so.
And as JSanders said, check with the company first as some will not allow a personal device to be used.
Plus the IT Policy can really lock down the device and restrict what you can and cannot do with it. And the camera adds another problem with security. Many firms don't allow it and the IT Policy blocks it.
If you lan to put your personal data such as contacts, calendar, email and use BBM, etc. That can also be an issue. You might want to check this link: What does BES see; what can be tracked/logged? - Port3101.org : Your BES Connection
IMHO, use the device the company gives you and if you feel the need, get the 9700 for your personal use.