How about a Ford Fiesta? It's bigger than your Ka, so will feel more robust, while also being reliable and cheap to run. It's also fun to drive and you could opt for the rugged Active model if you want something a little more SUV-like. Also, consider small crossover SUVs like the new Ford Puma, Peugeot 2008 and Volkswagen T-Cross. These have higher seating positions - which might be good for the kind of driving you do - without being significantly bigger or more expensive to run than a hatchback. As a left-field choice, if you don't need much in the way of practicality, take a look at a Mazda MX-5. They're reliable and cheap to run, while also being sporty and fun to drive.