Is 256gb enough to use xcode, Microsoft office student, iBooks author and download the iOS sdk

Please help as I'm not sure whether to get a macbook pro or air. I prefer the look of the air but I'm not sure if 256gb flash storage is enough for what I want to do. I would always surf the Internet and use Microsoft word, excel and PowerPoint but I would also like to try Xcode and iOS sdk. Thank you. However Im not willing to buy the air with 512 gb so if the 256 gb isn't enough then I'll go for the pro.