I'd personally wait for the n8, if you were even considering the Satio then I suspect that having a mobile geek pad (which the n900 awesomely fulfils) is not your #1 priority.

The N8 will have a good camera, HDMI out (!), and a slick looking mature OS

The N8 will be a better camera phone with features, the N900 would be a better mobile linux computer / hackmachine