Opinions please. Better multitasking setup: 21.5" with 2nd monitor or 27"? Please refrain from the obvious 27 with second monitor reply! That just won't work on my desk. I wish it would. I do web development and graphic work and frequently require multiple windows and/or virtual machines running and accessible. I've been running dual 1680x1050 displays for years and it has positively affected my productivity. I absolutely love the 27" iMac but I'm scared to death of giving up ~1000ish pixels of horizontal screen space. Has anyone gone from dual monitors to a single 27 and been successful? Or found that they couldn't live without the extra pixels? Or even stuck to the 21.5 for this very reason? Looking for experienced opinions to guide me. Thanks!