Yeah, I stumbled on to the payment plans. I'm not certain about the price points you've set there - it would ultimately depend on who your target audience is, and if they would be willing to pay $1200/year for 70GB storage and your current feature set (and branding, I guess).

It looks like you're trying to go after basecamp here - everything (interface wise) is as simple as possible, but it adds conversation and extra description to todos, which is an improvement over what they do.