I went with keeping the zed and doing a few bits to it, but of I was in the financial position to do so, I'd be having a 911 all day long. Servicing costs on the slightly older ones are on par with the zed and they're stunning motors, it ticks one of the must own boxes and if you get bored with it after a few years, hopefully 370s will have dropped in price and you can head down that alley again