I want to buy an iMac soon. I've been a windows user for years now, and I know that a pc with a normal HDD will become slower and slower as time goes on. I'm now using an SSD on my windows pc, and I can't really see any way of going back. Is this the same case with iMacs? I really want to get the ssd but apple charges 2x the amount for it as you can get a 240gb ssd for £240 now with read/write speeds of 275mb/s. But at the same time I do not feel comfortable installing the ssd myself, so I don't have much choice.