I also just bought a new MacBook Pro to replace my old machine — a bottom-of-the-line MBP from 2009. That machine is still running working well, even though I once spilled a glass of red wine into the keyboard. It was out of warranty at the time, but for some reason Apple decided to replace the motherboard and screen for free. I don't know why. Anyway, there are a couple programs I use that aren't supported by El Capitan, so it's time to retire it. I bought the low-end configuration again, which I expect will get me through the next ten years as well as the last one did.