Your best choice to pair with the Barbershop goby is the Randall's pistol shrimp. This is the smaller more expensive one, but is the natural shrimp to pair with the goby, also the best looking one IMO. It took mine about three days to find one another and have been together since. The only drawbacks are, 1) the shrimp stays in the burrow most of the time. 2) for a small shrimp they can dig alot.
My pair are housed with other small peacefull fish, The goby stays visable all the time either partway or just outside the burrow entrance and if watch the shrimp will ussually come out to be seen but doesnt stay outside.
All in all I'm very glad I paired mine and I say its definately worth it.