Keep the buzz if you do a lot of walking and buy a cheapo buggy for holidays, sling in the back of the car etc. That is very expensive for a buzz, how come it was that much?? If you drive everywhere they are a real pain so a quick umbrella fold will just be sooooooooo easy.
I'm not a maclaren fan, cheap, rattley but most people love them and so much easier than your buzz (hated mine, sold it and bought what should have bought in first place a bugaboo!!) You will prob really notice the difference in quality though but hey, they are so cheap you can't really knock it and they do last for years!!
bought everything with the Buzz - carrycot carseat, base and all accesories I do love it but know what you mean about car journeys although the carseat fitting on the base has been an absolute lifesaver!!