the p70 is hands down your best bet
it is stacker less..+ it is not mdb controlled >mulit-drop-bus< >straped-to-the-host<,
the stackers on the other hand can be >un-strapped<,i have taken
a v7 36vdc unit,and with the proper interface,4 pins and a few switchs on the unit
turned into a 12vdc stacker unit that is not staped to the host..works like a charm
will be putting it in a gt-live,the olny mode i did was re-arange the main plug
this can be done with ease..
now as far as e-bay goes i would not buy any thing from any person on there
unless they can without expectition they tell u it will take the new usa polys
and if there in canada i would not even touch it as there is olny a hand full of dealers
with the new firmware..these are the 1's i know..and they are giddie right now..
as it has not yet been made public
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