I'm a Web Developer who has always used Windows until my last freelance Job where I was provided an iMac 27 inch at the company's office for a month. I now prefer to do development on a Mac and would also like the option of doing ios apps. So I need a Mac that can run photoshop, dreamweaver ect and be fast enough to multitask. What would be the cheapest option for a Mac laptop or Desktop that can accomplish this? If it is a laptop I would want it to be capable of hooking up external monitor (1440p) and mouse and keyboard so it has to be powerful enough for that. I also would want whatever I buy to last at least 4 years.