All very good films. I'd be wary about using the term "best" on any of them except perhaps Princess Bride and Spinal Tap. I'm also not sure I'd call Misery a horror film. But they are all home runs. Reiner didnt make shitty movies'84: Spinal Tap - first/best mockumentary
'86: Stand by Me - best coming of age
'87: Princess Bride - best fairytale romance
'89: Harry Met Sally - i don't know the genre too well but maybe best comedy romance?
'90: Misery - maybe not best but a very very good horror
'92: Few Good Men - best courtroom drama
certainly not the greatest title, but the trailer looks terrificlooks good but man is that a terrible title.