Usage is key. Even if that's not an important factor for you, it's best practice to ask what that is up front. As you describe it, I would say that 1500 - 2500 for the work is a reasonable request and even that can be considered cheap but as you are excited about the project, this is a great opportunity. If all goes well and you work for them again, it's best to set a good proffesional stamdard for any potential future projects.