We'd recommend a Citroen C4 Cactus. It rides very well and your budget will get you a 2016 model with low miles. That said, you'll struggle to find an automatic with budget. Otherwise, there aren't many alternatives to your 2008 on the market for less than £7000. You could get a Nissan Juke, but it's cramped and the CVT automatic gearbox is unreliable. It might be worth changing the wheels on your 2008 for a smaller set - you might be surprised at the difference it makes to ride quality.