New iMac is just around corner and I was thinking what new will come with it? There have been rumors about LED display, DDR3 (which have been updared for every model), quad-core (?), NIVDIA chipset and new CPUs and GPUs. I'm tired to wait any longer so what exactly LED display means? What it'll do what this gen. iMacs' screen doesn't have? Is DDR3 much faster than DDR2, will I notice it in normal use? I was thinking of buying 24" 2.8GHz model with 8800 and buy 4GB ram later from other store. So my question is, should I still wait? I can't afford quad-core and I don't need it and it's same thing with 4GB of DDR3. Is 4GB DDR2 better than 2GB DDR3?