I notice that there are 3 different versions available: the standard 770 OS, and OS2007HE and OS2008HE.

Which one of those do I want? I want to be able to run all the latest software, mainly the ssh client, VNC, FBReader, and (assuming it comes out for Maemo) Fictionwise's eReader client. (Also, the best, most recent version of the web browser app, or a replacement, that I can get. Isn't there a Firefox thing for Maemo now? Can I run it on the 770 with one of the above OSes?)

I'm a command-line sort of person, so I'll generally be updating it by doing apt-get update;apt-get dist-upgrade rather than messing around with the GUI.