Which is a good sand sifting goby?

I'm looking for a sand sifting goby, at the moment I have an Engineer Goby. I'm not sure if they are good or not. I've read that they like to burrow and can get kinda big.
Which is the best for sand sifting or does it depend on you?
Replies are much appreciated ;D

 

dragon goby.
or diamond

 

I have a Diamond Goby and this guy never stops working. He will dig for food and then again for the fun of it. He also likes to dig holes under existing rock work and make several little homes for himself. He never bothers anyone... I luv him he is awsome

 

I have a pink and blue spotted Gobby. The guys at my lfs said it is not a sand sifting Goby but he loves sifting sand, does it all the time.

 

I have a gold head sleeper goby and he seems to constantly scoop up and spread the sand throughout the tank. Sometimes on my rocks I like him though.