i would say low XX, just because the double 'i' is going to be pronounced as 'ee'. when going for brandable it is better to make the name use the same letters that it is pronounced with, for example: Zipee would be better in this case.
Short brandable dot com.
However, 3 "i" in the name hurts the value a little, IMHO
Another way to look at the name -> zipII or ZIPii (zip2)
Low $xx undeveloped