Are plastic plants out? Should I have immortal plants, or plants that sway with the sun in my house?

That depends on how caring you are. Plastic plants look ok, don't go bad. They might have optical bebefits. But real plants have a life. They change, grow, bloom, smell, need to be taken care of. You can enjoy feeding them. They can even detox your room (for example spider plants do that.)

plastic. and make sure they have yellow or white flowers, that way, in case you are having a bbq and run out of cheese, the flowers can be used as a substitute.