What if you fail, how are you going to repay the debt?
Plan B) Suck it up, and pay for it for the next 5 years. Obviously, this plan sucks, but it's better to have tried, isn't it?
I'd love any other ideas for financing- We want to make this happen; I'm just looking at it, and seeing a loan as the most achievable option. I'd love to be wrong ;)
If they don't help you out financially, they might connect you with angels they know.
The short version: if you already have traction and are passionate, find an angel.