I got all the tapes. I use them all. Depends on the requirements. Depends how much color you want. There is currently a thread on GS on tapes. Worth it to check out. Lots of useful info  in there as the IKM manual is a little skimpy on how to properly use them.    Personally.  I like the 99 and 80 the most for my uses. Many ok others prefer the 24 for transparency.