All, I'm using a (gasp) mid-2007 iMac and sense that it would be a huge mistake to not purchase (before it's too late) a new iMac. In addition to Logic Pro overload messages being almost impossible to avoid these days, I'm worried that the system will just completely fail someday. In the past, by necessity, I always purchased the base unit. (The maxed out memory of my current iMac is maxed out because I added third party memory a couple of years ago. The unit came with half of what it has now.) I'm thinking that I should go to the other extreme this time: 27" because it has the current state of the art chips, fastest processor, max memory available from Apple, et cetera. Is this rational or irrational thinking? I've been reading as much as I can about the new iMacs, am aware of the misgivings and disappointments many people here have expressed, am reading less-than-enthusiastic reviews from journalists (who I suspect would be less guarded, less diplomatic, less generous if Apple wasn't a significant contributor to their respective employer's advertising revenue). So, I ask, humbly, for your advice. Is this a definite buy for me?