Has gaming really changed that much in just 10 years? Considering that the average PC user probably keeps their PC, with only minor upgrades, for at least three years, wouldn't it make more sense for each PC to reflect a three year period? Then you could showcase much more ground breaking technology such as the original Doom, Quake, or Unreal Tournament. You could even just do a history of gaming showcase without restricting yourself to a period of time. Start with Zork, move to Wolfenstein, then Doom, Quake, etc, with a powerful machine for each period.
I'm just saying that it would be a much more interesting display if the changes were more obvious than what has occurred over the last 10 years.