Eric,
Why are you considering the most expensive pellet? I presume since you are seeking advice that you have recently acquired your pistol and have not been shooting pistol for long. If that is the case, I would imagine that your average score is below 90 ex 100. That being so it really does not matter what type of pellet you use as long as they are of reasonable quality, RWS Hobby, RWS Gecco, H&N Econo or Diabolo Match. Your pistol is quite capable of holding the 10 ring with all of those.
Once your average starts to creep over 90 (540 ex 600) then it may be time to think about selecting particular brands, sizes and batches of pellets, but this can only be properly done with the securely mounted pistol in a rest. There is no "best" pellet for any particular pistol (or rifle), it's the one that puts up the smallest groups.
In the meantime, don't worry about pellets, buy cheap ones and practice more. You will be the cause of more bad shots than the pellets.
Hope that this helps,
Rutty