My two cents...

If you plan on using the phone data only, then the N900 or N9 aren't that bad of an option (NITDroid doesn't have working cell phone, AFAIK). But I'm pretty sure you'll quickly stop using NITDroid once you see that Meamo/Meego are so much more powerful, multitasking and all. If screen size is an issue, go with the N9. I personally would have a hard time without a keyboard or resistive screen (gotta love the stylus), but I'm sure you have your own priorities.

The N900 is about $200 new on ebay (or are they refurbished?), in any case, $100 less than the N9 is just crazy, where did you get those prices.

And finally, try to USE the phone (N900, N9) before purchasing, as that's the best way to go.

Good luck!


EDIT: Why not get a cheapo Android device for phone calls, and the N900/N9 for data? I doubt the apps you listed use lots of bandwith...