That's the problem I'm having with the trade... I like IJ and not real familiar with ICB and ZP... but it might be interesting to branch out to something new... maybe?
For me the value of this trade all depends on the quality of the machines in question.
A really nice IJ is worth more than a nice ICB and ZP combined.
An ok IJ is worth about the same as a nice ICB and ZP combined.
A crappy IJ is worth less than a nice ICB and ZP combined.
Now reverse that if the ICB and ZP are crappy or not so nice
Is there anything else to factor in on the IJ or is it factory?
I.E. you got any added value in it like color DMD, mods, even an LED kit ads value.
Some don't care for mods, but they are worth money and increase the value.
Now all that being said, I think you will get more replay value out of the I.J. then you would ICB or Zeke's Peak (which by the way are basically the same game for most practical purposes).
If I did that trade I would keep one and use the other for trade bait.