I wouldn't quite say that I'm a full-bore hardcore Deadhead, but I do like them a whole bunch and did get to see them twice before Jerry died, with one of my best friends who is a hardcore Deadhead. Back in the late 80's and early 90's my friend actually followed them around the country for weeks or months at a time, several times. I went with him to two different shows, The Omni in Atlanta, GA on April 3rd 1991 and Buckeye Lake in Hebron, OH on July 29th 1994 (Traffic opened for them!). Here's a great site that has all of their shows listed by location and date, and what songs were performed:
http://www.dead.net/shows
As far as high quality live concerts in 5.1 HD on blu-ray, I think I have everything that's available. There's Sunshine Daydream from '72, The Grateful Dead Movie from '77, and the Fare Thee Well 50th Anniversary 7 blu-ray disc set with Trey Anastasio from Phish on guitar/vocals from July 3rd, 4th, 5th 2015. There is also a separate two blu-ray set of just the last night. They are all very good quality picture and especially sound. All of them are in 5.1 Dolby TrueHD except for The Grateful Dead Movie which has the original theatrical audio and a newly remastered studio quality mix, both of them in 5.1 DTS-HD MA.
Keep on Truckin'!