I want to watch some live Rush concerts... are they all available on DVD these days?
You've got a number of options, all of which are available on DVD:
1. Exit Stage Left (Moving Pictures tour)*
2. Grace Under Pressure*
3. A Show of Hands (Hold Your Fire tour)*
4. Rush in Rio (Vapor Trails Tour)
5. R30
6. Snakes & Arrow Live
7. Time Machine 2011
8. Clockwork Angels Tour
9. R40 Live
* - These were originally released on VHS and laserdisc and were re-released in the mid-2000s as part of a set called Rush Replay X3. I don't know if they're available as stand alone DVDs
I bought the ESL VHS tape sometime in the late 80s. Had to special order it because it was really hard to find. My best friend and I spent many a Friday/Saturday night blasting it and drinking beer. It's still my favorite live Rush DVD. Although it has some of the antiseptic tone of the ESL album and the lighting is fairly poor, the playing and sound is spectacular. My only complaint is that it's not the full concert and the song order has been rearranged. It would be awesome to have the full concert released, but I doubt that will ever happen (even if the footage survives).
The Grace Under Pressure video is ok. It's also not a complete concert. It's notable for what was, at the time, the complete Fear Trilogy. Vital Signs is also very good. Closer to the Heart is notably weaker than the version on the ESL video. Mostly, it's a snapshot of what Rush had become in 1984, including (much to my personal consternation) the worst bass Geddy ever played (the awful, awful, awful Steinberger). As with ESL, it is not a complete concert
A Show of Hands has better production than GUP, but the song selection is weaker (as should be expected 10 of the first 12 songs come from GUP, PW and HYF). We get yet another version of Closer to the Heart and a slightly better version of The Spirit of Radio than appears on the GUP video. There's also a medley that includes portions of La Villa Strangiato. It is taken from three nights at the same venue but is, again, not a complete concert (again omitting Subdivisions and Limelight and, inexplicably, Time Stand Still).
The post-2000 videos tend to run together a bit. All are fairly heavily produced (which probably means lots of overdubs).
Rush in Rio is the first complete official concert release. It features the rather impressive performance of 40,000 incredibly enthusiastic Brazilian fans, most of whom I believe were seeing Rush for the first time. The band's performances were very strong, apparently being fueled by the crowd. YYZ is particularly notable for the crowd "singing" along to the song's melodies. The extras and "easter eggs" on the second disc are a lot of fun.
With R30, we get another incomplete concert (this was supposedly done to reduce overlap with Rush in Rio). The song selection is ok, but there are a number of very worthwhile "extras" on the second disc. It also features what I believe is the only official live video of Between the Wheels.
Don't have time right now to discuss the most recent videos, but they all have their high points.