Best Nikon slave flash mor macro?

[DarkGhost]

What would be the best slave to use with a Nikon SB800 for macro work. Was thinking of a SB600, or is complete overkill and a SB400 would more than suffice?

 

[TCR4x4]

If you dont mind manually setting the power, then a Nissin Di622 or even one of the cheaper yongnuos will do the job.