Here’s my top 5 (from each genus) that’ll fit into your tank size;
Cirrhilabrus isosceles - Pintail Fairy
Cirrhilabrus naokoae - Naoko’s Fairy
Cirrhilabrus exquisitus (Vanuatu var.) - Exquisite Fairy
Cirrhilabrus rhomboidalis - Golden Fairy
Cirrhilabrus lunatus - Lunate Fairy
Halichoeres iridis - Radiant/Iridis
Halichoeres cosmetus - Adorned
Halichoeres biocellatus - Red Lined/Christmas
Halichoeres leucoxanthus - Silver Belly
Halichoeres claudia - Christmas/Claudia’s
Macropharyngodon marisrubri - Red Sea Leopard
Macropharyngodon meleagris - Leopard
Macropharyngodon choati (Wait till you get experience in the Leopards before getting into this species) - Choat’s Leopard
Macropharyngodon vivienae - Vivienne’s Leopard
Macropharyngodon cyanoguttatus - Blue Spot Leopard
Anampses meleagris - Yellow Tail Tamarin
Anampses melanurus - White Spotted Tamarin
Anampses lineatus - Linear/Black Tail Tamarin
Anampses neoguiniacus - China/Black Back
Anampses twistii - Twistii
Xenojulis margaritaceus - Gold Nugget
I wouldn’t personally do
Paracheilinus species in a tank less than 4’x2’ floorspace and I believe 75G tanks at 4’x18” but correct me if I’m wrong