I would say if you charged $2k/week and met your promises you would make one hell of a name for yourself. As prof devs we charge more than that, but I have found that the more we deliver the more we can charge and frankly the more we can frankly demand. 4-5k/week is still fairly (cheap) reasonable per developer depending on your area and experience, just to give you an idea. But for a newbie, I would stick with the 1.5k-2.5k/week. And please don't try and charge per hour, our experience is it just never works out in the benefit of anyone. If you are learning on the job, then it isn't fair to the client, and if you aren't and are proficient then your estimate should easily take into consideration the weekly billable rate and hours to complete the project. When you bill by the hour my experience is people feel you owe them every minute and will chase you for it, if you bill by the week and provide them valuable service they are more than happy to let you be and get your work done.

At least that has been our experience over the past few years.

Good luck either way, and make sure you graduate with good grades, regardless of your choices for college! Also, charge 1.5-2k/week and ask them that for the consideration of a discount you want to utilize their name in advertising or as a reference on future work. It is all your risk to deliver and do your job, but pays you back massively over time, not to mention rarely will people object to this if you do your job.