My late 2009 2.25GHz Intel Core 2 Duo Mac Mini has done well and is still running great. Along the way, I upgraded the RAM to 8GB and the Hard Drive to a 250GB SSD of which I use about half. But El Capitan is as far as I can go and I can no longer update the software that is important to me. I can only afford about £500 to invest in a "new" one. For example, a refurbished 2012 i5 2.5 GHz model with 8GB RAM and 250GB SSD with six months guarantee would set me back £470. But one of Apple's refurbished models, a 2014 budget model with twelve months guarantee i5 1.5GHz 4GB RAM 500GB Hard Drive is going for £399. And maybe the budget model hopefully released fairly soon will almost come within the £500. These latter two options will make for a Mac Mini that will last longer but the first option is more powerful. Sorry this is long-winded, but my question is how much RAM do I need, do I need an SSD and how fast a processor do I need? I use the computer mainly for writing, Scrivener being my favourite app. I surf the web a lot, write e-mails and watch YouTube videos. I also listen to music in Spotify and iTunes so my demands are possibly less than most peoples. Thoughts would be appreciated.