As a guy who has nine wrasses (had 11 but had to remove two) between two 40 gallon tanks, here's my thoughts. Do not get a 6 line. They are aggressive towards other fish, particularly when added close to last. If you plan on getting another male wrasses at any point, do not get a lubocks wrasse either. All my wrasses expect two are under 2". I am upgrading one of my tanks to a 75/90 and it will house just my wrasses in a few months. You should def get one of the following:
Male Eightline flasher
Naokoa fairy Wrasse
Bonded pair of 1" girdled wrasse's
Royal flasher wrasse
Red line spot flasher wrasse
Then their is the ever popular and very hard to get diamond tail flasher wrasse. I managed to score two of these beauties.
These are what I have currently and would recommend for color, personality and movement.