I would 2nd the Royal Albert Hall concert from May 1966.Rather than pay $69.00 which is the cheapest I've seen on eBay I would go to BobsBoots.com and look at the plethora of boots of this show and get one of those off eBay at around $20.The sound quality on most of the boots of this particular show is excellent.As far as the"sort of whacked out version on Self Portrait" I am not in agreement of that evaluation.It's with The Band backing BD on the Isle Of Wight,first show back after quite a layoff.Many problems led to a long day of waiting.The promoters had never put on an event prior to this one,nonetheless i find it a satisfying performance.However the "Royal Albert Hall" performance is likely Bob at his performing best.The advantage of Bootleg Series Vol.4 is that it includes the Acoustic set as well.