you know people would get reavers if there were arbiters
although I guess making them do INSANE AMOUNTS OF DAMAGE might work too
I am still hesitant to add arbiters considering on how constant cloak/decloak would slowdown and how their base SC1 abilities would be very abusable in big numbers. If I do bother, they would probably only have the cloak for units (not structures) and probably a much smaller cloaking range than Motherships.
Well, reavers already do 100 damage/scarab + some splash and they only cost 200/100 a pop. At best, colossus is always picked over them despite reavers being ground army wreakers.
In terms of permanent buffs, I can only see giving reavers more base speed (other than the rapid fire idea)