If you ever have the chance to get a copy of a show from mid 70's, do so. I am currently listening to a show from the Animals tour. They do Wish You Were Here in one set and Animals in the other set, with Money and Us and Them for encores. Great stuff!
Also, I know earlier everyone was down on The Wall and I know it is not always my favorite to listen to from beginning to end. However, the live disc they released is VERY GOOD, much better than the studio version, with much more jamming and Gilmour's guitar work is great on it. It adds a different dimension to the body of work, even without the visuals that were going on around them while it was being performed.
DO NOT think Delicate Sound Of Thunder and Pulse are proper representations of what was being played by the 70's version of the band, they sound stale by comparison. IMO.