"Smells Like Teen Spirit" is the name for the song you call 'Entertain Us'. Personally I slightly prefer Nirvana's grungier, rawer side, stuff like Bleach and Incesticide, and lots of the stuff from their rarities, demos, B-Sides, and stuff (Found on bootlegs such as Outcesticide).
Their more mellow side is awesome too. Songs such as 'Heart-Shaped Box' and 'All Apologies' are true testiments to Kurt's vocal abilites.
Now, most of their live performances are good, but the one that completely pulled me over was MTV Unplugged in New York. 'All Apologies', 'Pennyroyal Tea' and 'Lake of Fire' are some of the premeire songs their. I knew 'The Man Who Sold The World' as a Nirvana song before I found it was a Bowie cover.
Anyway, I have more to say, so like I said before, IM me so we can chat about Nirvana.