@JeannineC
There are several genus of wrasses that will fit what you need. For colors and activity, I would add 4 Flasher wrasses and three small Fairy wrasses.
With Flasher wrasses, it really does not mater which species other than the Red Sea Eigth-lines Flasher wrasse (
There is a wrasse call Eightline wrasse that you want to stay away from, not the same as Eightline Flasher wrasse). This is a large wrasse that growth to be 6 inches in my tank, and acts like a Fairy wrasse rather than Flasher. Prices of the flasher varies from 40 to thousands depends on how rare they are. I would get the common, but very beautiful flasher wrasses (Carpenter, McCosker, Yellowfin, Peacock... ...)These guys run at the most 50-70 or less each. I would get three more docile smaller Flasher wrasses. Exquisite, Naoko, Lubbock are all smaller and very beautiful Fairy wrasses you can get at the lower end of cost.
Other than Fairy and Flasher wrasses, I like to have a harem of Leopard wrasses of 3. I like Black Leopards or Meleagris Leopards. A harem of these guys are interesting and beautiful to keep.
Pencil Wrasse also rewarding and beautiful. I have Splendid Pencil that I really like in my tank.
A few Halichoeres wrasse also very nice to keep in our tank. I lover the Radiant Wrasse. I have a harem in my tank also.
I don't keep Cardinals so I don't have any ideal how the wrasse with deal with Cardinals. I do think that the wrasse likely not bother the cardinals at all. Perhaps somebody here keep cardinal together with wrasse can comment on this