Thanks for those ideas. So it looks like to get 04+ with HUD and stay V6, the choices are 04 GT2 & GTP and 05 GT & GTP? Looks like for 06+, HUD is only available with the V8.

Highway mpg is important so non-supercharged 04 GT2 and 05GT which are available with HUD might work, but I bet other nice features would be dropped. Or I'm making it too complicated, should just get an 05 GTP.