I think it would be a nice change of pace to have a wealthy border city. US perceptions of Mexico are - as you mentioned - inaccurately skewed towards a disenf

I think it would be a nice change of pace to have a wealthy border city. US perceptions of Mexico are - as you mentioned - inaccurately skewed towards a disenfranchised class of Mexicans, notably absent of the privileged class that is completely content with Mexico.