will visit soon and would like some expert opinions, pls?

When is soon?  It can change pretty fast.  Can you tell us more of what you're looking for?

Right now there are 31 girls on EROS alone:

http://www.eros-houston.com/sections/houston_shemale_escorts.htm

And, a ton more on Backpage.....

http://houston.backpage.com/TranssexualEscorts/classifieds/Results?adLanguage=All&category=749510

Houston is a strange city, conservative and huge.  There are not that many local ts girls there that have steller reputations like an India Fox or Daisy.  Many travel there. You may want to check back with the board when you get there for some immediate feedback on girls traveling there.