I read somewhere that none of those bands wrote Hey Joe and that strangely, the Sufaris were the first band (who also didn't write it) to record it.
Jimi Hendrix and LA based The Music Machine both did slow versions of Hey Joe, the others I've heard are all fast.
The original Deep Purple (with singer Rod Price and bassist Nick Simper) did a slow cover of "Hey, Joe," too---I believe it was on Shades of Deep Purple, their first album. (The original Purple did some intriguing covers even beyond their hit single versions of "Hush" and "Kentucky Woman"---their take of "River Deep, Mountain High" was a pleasant surprise; their version of the Beatles' "We Can Work It Out" is nothing if not unusual.)
As for Arthur Lee, his death is a shame but his best music (namely, Love's first three albums) endures. John Densmore, the drummer for the Doors, also credits Lee (he wrote of it in a piece for the Los Angeles Times) with recommending that Love's label, Elektra, give the Doors a pull, too.