Yes, you are correct.
If you ever have trouble remembering the difference between 认为 and 想, just look at the characters themselves:
认为 - 认 means "recognize" and 为 here is kind of like "to be", so 我认为 is like saying "I recognize [something] to be", which is basically "I believe..."
想 just means "to think", or sometimes, "to think about". You just use this when you think about something, or when you want to do something.
To add to your list a little, there is one more important one:
以为 - this is used like 认为, but frequently implies that what is thought is incorrect or baseless.