I have searched - and just got more confused. I want to hook my new mid 2010 27inch iMac to my old 24inch Dell monitor. Which freaking cable do I need to buy? I know I need a MINI DISPLAY PORT out of the iMac - but to DVI? Dual link? VGA? HELP. The old (about 4+ years) Dell is 1920X1200 max if that helps.