I think OnlineWebsiteMaker.com is the best of all, without development it's easily worth mid-high $xx.
UniqueProfits.com is also nice, but you need to develop it to gain an extra value.
I quite like CarbRecipes.com.
I have a food-related site of my own and have found that recipes are very popular. Also you have the big US market and their interest in health food. Another niche, which you may not have thought of (or maybe you did LOL!), is the outdoor sports person.
One of my friends is a keen yachtsman and he's always asking me for high carb recipes.
Perhaps a little bit of development would make it easier to sell. (I don't know, I'm just a newbie who's trying to help.)
I think CarbRecipes UniqueProfits have the most appeal, could easily see those been utilised as reasonably popular websites - worth developing !
Domains such as these often sell for high $$$ to low $,$$$ - without development.