I have amano shrimp and they're great! They keep plants spotless. They are also really good to watch and suprisingly have quite a bit of character. One of my shrimp fights off my corys and steals their algae wafers and swims off with them to the top of a rock where they can't get to him!
They like to be in a group (minimum 3)
They also change colour from time to time (e.g. after they have eaten an algae wafer they turn green!!)
They grow to around 2 inches.
They don't bother any fish and most fish wont bother them. I highly recommend you get some!
Cherry shrimp on the other hand are very small and may get eaten which is why with 2 Gouramis I;ve never bought any.
Enjoy!