Depends how high is high. If high is greater than 20k, then south of Denali, there are no high mountains until South America.
I second Picacho del Diablo as a very worthy peak. It is a beautiful mountain isolated in a very rugged range. It is well worth a visit (or two). Totally unexpected to see pine forests and snow in baja. On my visit, we saw a mountain lion about 40 meters to the side of the road pacing my car. It followed us for about a minute before it got bored.