Synthetics?

[JOSH GARY]

I'm going to be changing the Transmission(manual) fluid in my Frontier soon.
  One of the local car parts stores can special order Royal Purple synthetic
fluids.  I've heard good things about Redline synthetic Transmission fluid;
but, I've never really heard anything good or bad about Royal Purple.  I'm
eventually going to change the tranny fluid in my Sentra over to Synthetic
as well.

What would you go with?  And also, where is a reliable place online to order
Redline from?

Thanks,
Josh

98 Frontier 2wd XE (Flowmaster muffler and K&N air filter element)
02 Sentra SE-R Spec V (Stock)