We have a couple of standard sammiches in the SF household. The main one is boars head tavern ham, white american, some lettuce and tomato on whole wheat. I've been using those circle flatbread thingies which I like a lot. The key to this basic sammich is the sauce. About weekly, I take some greek yogurt with some mayo (I use the yogurt to make it healthier than straight mayo) and about a half can of chipotle peppers and sauce. Blend smooth and wallah. Its an easy/somewhat healthy spicy mayo we use on about everything. Pro tip, it tastes almost identical to just using mayo but the texture is off. Adding a bit of mayo, more chipotle sauce and some lemon juice thins it out a bit to be more like mayo only.
I will also smoke chicken breasts, slice, then add avocado, tomato, onion, and the sauce. This is Mrs SF favorite sammich. Both very simple and delish.
I am very jealous of AST's sammiches. They look delicious, but I think I cut my gums just looking at those picks. I apparently have weak gums and really toasted bread tears apart my mouth like I am chewing on glass.