+1 on monorail. They still serve a different enough purpose to say, using an elevated metro system. Metro is designed for longer distances, Monorails can more cheaply and easily weave their way through city streets tackling the tight 90 degree turns with ease and you can even integrate a station into a building... (be interesting to see if the devs could implement that in the game

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and not to mention it would have higher appeal for tourists and white collar workers. Plus it would simply be cool to add in.
Also, I liked the monorail from CiM1 but it would be cool to see some of the other styles of monorail vehicles like the Von Roller, which was a very common design.
Also, I like the lighter blue hue of the monorail track that is used as it looks less drab than the grey of the CiM monorail.
Also, there are some interesting station designs to be found.