*shrug* I don't really find RCS to be anything special
If RCS aren't your thing then you could try some wild type neocardinia. You should be able to buy those for $.25 - $.50 a piece. They are the same shrimp as the RCS but havent been bred for the color.
I would stick to those over ghost shrimp because the ghosts could possibly eat the fry while the neocardinia wouldn't touch them.