Hey guys - I need advice on whether to buy a 20" or 24" iMac, which I plan to buy right after MWSF07. I'm in agony over the 24" screen. I know 24 inches would be awesome in every way possible (I watch lots of video, and do a fair amount Photoshopping and Dreamweaver-ing) and well worth the money, however I've read way too many reports on this forum about 24" iMacs humming badly when the brightness is turned down, general unreliability and the screen just being too dang bright to handle. So, are all 24" iMacs technically defective right out of the box? Can anyone shed any light on this and share your stories on how good/bad your 24" iMac is?