I dearly love Seattle, it would have been cool to just have it for custom races or license tests/missions or whatever.Tokyo R246 would be amazing. It's pretty much a real life "circuit" in Japan and it even has the Honda HQ beside the main straight. And the track IMO was amazing with lots of high speed sections and overtaking oportunities.
Seattle no... The "ramp" part of that circuit would just not do it with these day's standarts. And all other city courses in GT4 were either too small in lenght or way too narrow unless it was for only a 2 car race.
Monaco would be a great addition. It was in GT4-GT5-GT6... Why the hell is it not here in GT7...