Hi Pieman,
I've not played any of the games you have listed, but I did find an excellent little property trading game - Property Millionaire (www.propertymillionairegame.co.uk).
It's an e-boardgame, like Cashflow, but has a lot more to it than Cashflow 101 ever did. If you think of Monopoly with a fluctuating property market and different kinds of properties having positive or negative effects on other property values around them, then you're getting close.
It's cheap too!
Hope that helps!
LS