I do not think that is too many fish for your tank, but do agree with previous posters about the dragonette. They are really cool and beautiful fish, but they only really eat pods and cannot compete with an aggressive eater like a six-line.
Start with your other 3 and think about the wrasse and dragonette later. You may find a less aggressive wrasse or something you decide that you want even more. Stocking slowly has a lot of advantages.
A good fuge with macro algae, disciplined testing and water changes, knowing how much to feed, good skimmer, and a good clean up crew have at least as much to do with how many fish you can have as the sheer size of your tank in my opinion. If you get 5 fish and your water quality is still great after a while, then you can consider adding another one.