Don't worry, you got the names right. Call of Duty and Call of Duty 2 both had expansions, called Finest Hour for CoD 1 and Big Red One for CoD 2. My personal favorite is Modern Warfare 2. It just feels right, and it was before they really watered down everything, and it was before the legal battle which ended with Infinity Ward being totally reconfigured.
Xbox LIVE Gamertag: Devchar96 Now Playing: Skyrim (X360), Modern Warfare 2 (X360) and Minecraft (PC).