Kershaw Random Task I/Random Task II/Random Leek questions

[shadowofleaves]

Assuming that a good example of each model were to be miraculously available for purchase, which one would be best to go with? This question is being asked from the standpoint of practicality. I understand that each one is collectible in it's own right and that they are all discontinued now. I am also aware of the limited numbers made and the different steels used in each model. My question is which would be the best choice for EDC and user serviceability. I have read threads about replacement parts being scarce to unavailable for some of these models. I am inclined to think that the Random Leek is the most practical, assuming that it shares common parts with other 1660's. Finally, is a custom made Random blade available from any knife maker as a replacement/conversion part? Thanks in advance.