I've a ~2.5 yo white 24" iMac and a ~2.5 yo white MB. Between woman, two boys, and I, we do much surfing, school work [MS, HS, and college prep], work stuff [MS PPT, Excel, MiniTab, Word, etc.], music playing & editing, and video & RAW photo processing / editing, along with some game playing - both on-line and local. Absolutely love the iMac, and am now [after the yellow tinting and grey bars are decreasing / gone] looking at the 27". But, had the thought too of going to the MP, due to its expandability and so much more extra power, mainly for long-term use... yet, the cost of a upper 4-core + a quality monitor is ~2.5-3x the 27" top line iMac. One reason why looking at MP is that, for example, when editing / processing RAW photos on the iMac [all images (80k some) are stored on a Buffalo external HD via FW], at times processing is quite buggery... using iPhoto and/or PS Elements. Have SL, latest most recent updates to all components. So, w/ that background, the best bang for the buck, considering long-term life, given what we use these computers for, best recommendation? Lastly, what w/ USB 3.0 supposedly being released sometime this year, any thoughts on it, when it could be included in iMac and/or Mac Pro? Don't like the thought of getting computer now, and 3 months later or so this semi-important upgrade is out... Thanks. PS: take also into account MP is due for upgrade and new release, and the iMac is in mid-cycle.