I have 2 vampire shrimp in my 75 gallon, and 1 in my 50 gallon. They are perfectly peaceful, but do stay hidden much of the time. I love them anyway, it's fun to watch them hold their little "mitts" up in the air, filtering for food. I recently read that they like to live in groups, so I might try adding a couple more (to each tank) and see if that makes them more comfortable to be a little more visible for my enjoyment.
If you want a shrimp that will be "more visible" I would go with a bamboo shrimp. The only thing is, bamboo shrimp are more territorial and aggressive (toward each other - they are not aggressive toward other tank mates in my experience) so you shouldn't have more than one in a tank...but ALSO, you need to have a secure lid because they do have a tendency to try to climb out! I lost one this way, found him about 10 ft from the tank he escaped from (sadly he was dried up and dead).