Dude(OP), I was very close to your situation a month ago. And I took the leap and bought the Nexus S. One of the best decisions I made all last year.

You can download free and open source applications just like you could before. Tethering and SIP are unlocked right out of the box. The experience is excellent. And you'll be using a platform that is at least similar to what your clients or coworkers have.

If you want a "sandbox" phone, the N900 is fine. But if you want a mobile device that actually stands up to real world use and won't be a chore to work with, I'd recommend the Nexus S.

If you're really holding out for a Meego phone, by the time meego is ready for primetime, you'll have the N9 (or wish you did). Move on, the N900 was a good idea that never went anywhere thanks to half-hearted support from Nokia.