I'll tell you right now you are sunk. Having those exact feelings about Tahitians are what got me to collect 22 Tahitian strands, ropes and tin cups. I keep a list of the colors I have so I don't duplicate. It's the only thing that has saved me everytime I see a Tahitian sale.
The stands you have chosen are very nice. You might see more colors if you are wearing the right color with them. The overtones can either pop out and show themselves or go completely dark and dull depending on your outfit.
But if you aren't in love with these strands send them back and find one that is right for you. White pearls seem to go with everything but Tahitian pearls are very different so keep that in mind.