Purchase Planner - Add Items

For several months I am feeling the need of purchasing few devices for my workstation (including a 27" iMac). So, I have to start saving money for those planned purchases. This moment of need provides me the idea of designing an app concept that will help people plan their purchases and maintain track of saving for those purchase. Here is the first few screens showing the flow of adding an item in the plan.

I have tried to follow the minimal style and easy interactions. I really like the works of several designers who are following this clean style. Though I know there's lots of possibility of improvements, I would love to hear some feedbacks from you guys.