Hey, I have the 2010 (version just before the latest firewire model) iMac 27" with the top quad-core processor and the stock 4Gb of RAM. I can hardly say I'm lagging for RAM, but like to have Ableton Live open constantly, as well as iTunes and various media players - it would be nice to know I've got things covered. Is the £39.59 (4GB x 2) RAM upgrade kit from Crucial a good choice? And is it the correct RAM for my model? I don't mind spending a little more if it's worth it, but would draw the line around £70.. I believe I can stick this in the two spare slots, meaning I have a total of 12Gb of RAM? This sounds like a great value upgrade! Will order swiftly if I hear good news..