Man, I would love if Voyager came here but it's pretty rare that the bands I listen to play in Spokane. They always play in Seattle and just figure that must be close enough (~300 miles away).
Opeth has come here a few times though. They played in Seattle during their tour with Dream Theater and 3, and then swung by for a show in Spokane the next night. DT didn't make it but 3 and Opeth both kicked some ass.
Amorphis was supposed to play here once but the show unexpectedly got canceled the day before. I'm not sure if they didn't sell enough tickets or what, but me and my friends were totally bummed out.