The two bootlegs (audience & radio broadcast) of the last double J concert in '81 that the live Stand in Line is culled from. The whole set is on fire, the guitars are feedingback wildly between songs, the band are arguably at their live peak. With any prospective box set, should/when it ever materialises, I live in hope this entire concert was recorded and could be restored and released in the fashion of Stand in Line. There are others from '79/'80 that are on your list that are also awesome, but I think I've reached a point where the double J gig is my pick.