After 8 long years on my 2007 iMac, I've realised that it's struggling to cope and I'm spending a lot of time waiting for things to happen on screen. Ordered the 27" 5K which should be arriving tomorrow. Was initially going for the fusion drive but after following the general advice on here, I've ordered the 256GB SSD. This means that I've now got to put all my media on external drives. I'm quite keen on photography and shoot RAW exclusively, so the iMac will be put to us in processing using Lightroom. Will be buying a Samsung 850 Evo (500GB or 1TB, depending on price drops on Black Friday) for my photos but will also need an external spinner to store my music/movies/videos/other stuff. So coming to my question, could you guys please suggest a USB3 external hard drive (2/3TB) that is quick to fire up when I need the files off it? Something that won't break the bank either. Also, I'm in the UK, so it needs to be available here. Thanks in advance.