Okay, so I'm happy with my iMac (July 2011 8GB RAM 2GB VRAM 27") But i do very intensive rendering, photo an music work. Toyed with 16GB at purchase time but thought I'd wait and see. The machine is an I7 blisteringly fast, and it's hard to slow it down even when I'm making it work it's Backside off. But now and then it will slow down when multi-tasking etc. So I'm looking for the proper modules to take me to 16Gb Apple prices a tad high Ideas for a UK based outfit?