Unless the college provides workstations, you are gonna want something a little more powerful for graphic design. Also, there is no point at all in getting a Mac for what you are doing. You don't seem to need the software and you would be far better off in terms of cost and performance if you found a nice sleek Windows machine. If you don't like Windows and want the Mac for the desktop environment, I would install Elementary OS which is a Mac-like Linux distro.