As a diehard Who fan, let me tell you all you need to know.
GET WHO'S NEXT! There is a 2-disc rerelease that will serve you well. It is IMO the best rock and roll album ever. Especially if you take the time to find out about the Lifehouse concept. When you wrap your head around what Pete was trying to do after Tommy, and see how all the songs written around the time of Who's Next are related (Bargain, Baba'O Riley, Going Mobile, The Relay, Join Together, The Song Is Over, Naked Eye, Pure and Easy) it's just stunning on the amount of thought and techincal mastery that has gone into it.
That and Roger Daltery has was has to be the definitive rock and roll scream on Won't Get Fooled Again.