Hi! I am planning on buying a new iMac 27". I currently have a PC with a Dell U2711 monitor running at 2560x1440. The monitor has DVI (2 DVI ports), HDMI, VGA and component. To be able to run 2560x1440 I am using the DVI port. I am wondering if I can connect this monitor to the new iMac 27", and run it as a second monitor (dual monitor, extended desktop). Is this possible? If so, what cable(s) do I need? Do I need the "Mini DisplayPort to Dual-Link DVI-adapter" because the external monitor is 27" and runs on 2560x1440? Or what cables do I need? Help is appreciated!