I just got my first zentai - and had one for my girlfriend as well - I choosed that "wetlook" from DHYA in Germany : look and feeling are both GREAT ! and my girlfriend looks and FEELS gorgeous too !
She was reluctant at the beginning, but now she loves it because she KNOWS she looks great in it !

http://www.dhya-shop.de/index.php?cat=c55_Wet-Look.html

I would definitely recommend it to those having a hard time converting their GF to zentai.

I think that's the model these two ones are wearing here, (looks pretty much the same on us) :

http://www.youtube.com/watch?v=yV4oUh1fm0I