"I wouldn't use a shelter which did not have a vestibule. Priorities..."
Yes, I know what you mean. Like, for example, I would ski with a jacket on...but that is just me ;) My priority is minimal weight and tight (read: relatively small footprint) pitching.
Mike, I hear you with cooking. But in my neck of the woods, cooking in the vestibule will surely attract Grizzly Bears. They aren't much fun to barter with over food. Trust me. For cooking, I have a 6 oz tarp that provides plenty of coverage AWAY from where I sleep. Then all the food and the tarp are bear bagged.