I am in the market for a new all-in-one computer and I'm looking for a good deal. How good of a machine is the 20" 2.66 Refurb model ($999) when compared to the new 24-inch 2.66GHz machine? I am having a hard time convincing myself that I really need a 24" display or a 640GB hard drive. Is the lifespan of these machines significantly different? How do you justify the $500 price difference? I can pick up a 4GB memory pack for around $60 correct? Here are the specs on the 20" 2.66 Refurb from apple's web site: 20-inch glossy widescreen display 2GB memory 320GB hard drive 8x SuperDrive (DVD±R DL/DVD±RW/CD-RW) ATI Radeon HD 2600 PRO with 256MB memory Built-in iSight Camera Will the refurb likely come with an iLife09 disk?