There is a general rule that the live record is the fans only or contractual recording and avoided at all costs. Fine but of course all rules are made to be broken and every collection needs a copy of AC/DC If You Want Blood, You've Got It
I'm sure I'll dig out a few more essential buys as I work through my collection. Armed with those three you can't go wrong. As an aside, on release, the Kiss Alive 11 disc was hailed as the best live recording of all time by then Sounds scribe Geoff Barton