Hi guys, I am a soon to be switcher who is looking for some advice from the macrumors collective brain. I have an old as the hills Pentium III desktop and after using an iMac at work over the last year and saving my pennies I think I am now ready to buy a mac. I was going to buy an iMac last year but buying an xbox 360 derailed my plans a bit... My choices at the moment are either a new 2.4 ghz 20 inch imac or a white 2ghz 17 inch C2D imac that is at my local store for $950. The new iMac would be great because of the larger screen and faster processor etc but I don't find the 1.83ghz CD iMac at work slow at all. If I buy the 17 inch then with the money I save I can buy a separate moniitor (22- 24 inch) that I could use for extra desktop real estate when needed and would also double up as an HD display for the Xbox. My main concern is with the graphics because I do dab in a bit of gaming (hence the 360) and I would like to play some of the PC exclusives that don't make it on to consoles. I know that the graphics cards in both the iMacs (x1600 and HD2600) aren't really up to much but will there be huge difference in performance? This is pivotal in my decision and if the games that don't run on the 17 inch won't really be much better on the 20 inch then I think I would go with the cheaper option. So what do you guys think? Will I see a big difference in gaming and general performance if I go for the 20 inch or will the 17 inch suffice for my needs (some gaming, web surfing, movies etc.)?