I am in the same boat as CoS - the Signals Tour needs more exploring on my part. The 5/21/83 London show is the best sound I've heard, but lacks some of the blistering racket of a hot audience recording. The Nassau Coliseum show from 12/9/82 has the racket and is a pretty hot show with Chemistry, but the sound isn't great. If you've ever been to the Coliseum you'll understand when I say it's fun to listen to the show and think of Rush, a big arena band by that point, playing in a pretty small hockey rink out on Long Island. If anyone has other suggestions/favorites, it'd be great to hear.
Regarding the tour itself - I wonder how people here feel about the setlist and performances compared to other tours? To me, it represents a big departure for the band. They jettisoned a raft of old stuff, like ballast off a balloon basket and focused on presenting most of Signals/MPs and some persistent old nuggets like In the Mood, 2112 I, ii, Closer to the Heart, La Villa, and Spirit/Freewill.