Take your time to think about it thoroughly before you buy one. I decided after several days research and careful thought that the dual zone one would work best for my family. I am obsessed with it. We literally haven't turned the oven on since we bought it, and the recipes we have planned in the near future, we don't need the oven at all either.
With the functionality you mentioned higher up, I just wanted to mention that I'm the kind of person who has to have the highest spec one of whatever I'm buying, otherwise I feel like I'm missing out on features. It's a fault of mine