This is just my $.02 worth, but I hate any book made into a spiral thing. Once you have opened it once they never go back just right and you end up fighting with them. You can't rapidly scan the pages and they get all hung up. They are only good for dumpster target practice after all the pages have been torn out from the turning of the pages full of all those little holes. Which is after they have laid around for a couple of years and gotten all dog eared because most of the pages have been half way torn out just by turning them. Spiral bookbinders should be wrapped in their own spirals and made to turn forever.
I like any size, style, format - I'm not a good one to ask but thought I would give my tid-bit of preference. :-) If it's a book, then I like it! Good luck on the endeavor though, sounds like something to add to our collection in the future!
__________________ ~there might be a little dust on the bottle, but don't let it fool ya about what's inside~
Time/Life had a series of cookbooks of world cuisines back in the 70s. They had a large hard back book for the main text with a smaller spiral book with just the recipes. Both fit in a slip case. Really a great series and also a great idea as the recipe book was easy to use in the kitchen.