For the sake of argument, however, I am going to cite a few parameters by which the Umid M2 is closer to your ideal tablet than the N900: 1. 1024x600 screen resolution 2. USB host/otg port (at least one, possibly expandable via hub) 3. Higher external display resolutions 4. Option for 1GB RAM ...not my words, as you will recognize. Surely you have more reasons to like the N900 better, and you're free to share them.
However, I think you should agree that putting down an unreleased device solely for the OS it originally ships with was impulsive rather than rational.