Well maybe you should get the n900. Every other week something new and impressive is happening. A lot of people are selling them but they don't know. Why not brush up on your linux skills and play with one.

You will be impressed and as far as community goes they still have a community for the Tablet 770, 800, and 810. All those devices are considered way past their prime and people are still doing things for those particular platforms. And since the n900 will support Qt all the new higher-end devices will all be able to run the same app. I think that all the cool things that Nokia is doing with phones lately, the n900 is the prototype device that is used. Like the technology that allows you to download a whole album at the Nokia store in like 8 secs.

The HD2 is like one year past its prime. It if came out last year, go for it. Now you know that phone will not be getting Windows 7 and they don't have a lot of apps that you would find useful as a user. I am pretty sure it will be hacked to death but any program that you find useful on another platform it already exists in the Maemo community is some shape. And if it doesn't you always have the ability to go to the website itself and do what you need to do.

Just my two cents.