Hello, first time poster here in the market for a new Mac but need a little help. The most intensive individual task I am likely to do is encode & edit home HD movies with effects. I will also be running virtualization software with lots PC and Mac apps running simultaneously -- including Photoshop and web & software development. I know Web browsing isn't considered a taxing application but I regularly have 50-100 tabs open at a time. Stability and efficiency here is absolutely key. I won't be doing any gaming, 3D animation or anything like that. No matter how capable an iMac may be for the task that is not an option. I always want the option to upgrade my display. Will my use be intensive enough (or intensive in the right way) to get an appreciable benefit from the extra cores and RAM of a Mac Pro? If I can get away with a MBP I'd love to have the portability option but not at the expense of a significant performance hit. This may be a stupid question but are quad core Nehalems in the MBP future? Thanks in advance for any help. I used to be a Mac-only guy but I haven't bought a new Mac since I got my G4 which sees little use these days because I can't run Windows on it. My last few computers have been PCs (the last one I built myself) but I'm ready to come back. However, buying a Mac feels like a much harder decision. If you get something wrong on a PC (processor, video card, etc.) you can easily swap it out if you need to. With a Mac I feel much more pressure to get it the first time because of high startup costs and limited upgrade options.