Answer,

it's been awhile since i've been there, but the Roundup (after midnite) has quite a few tgirls.  you might see Amaya or Kayla there and if you are lucky Toni Tease might make an apperance.

you might be disappointed with the tgirl scene in new orleans (compared to Brasil).  It's a much smaller community.  you will have great time eating and listening to music.

don't have any experience with Athena and Nomi.  I do recommend Toni Tease - great body and cool personality.

have fun in new orleans!