I too prefer Gillan/Glover but thought Hughes/Coverdale played a blinder that night, also i'd put Burn & Mistreated up there with the best of Purple tunes.
Ritchies playing is stellar, though he could have cut the end bit of the solo and brought the band back in as they were pissed off with him, you can here Hughes shout 'Ritchie'.
Epic all round though, they were untouchable in the early 70's.