Used to be the dogmatist: "mouse is bad!"
Now I'm a pragmatist, do 90% of my work on a Thinkpad using keyboard shortcuts, but use the little red trackpoint mouse whenever it's more convenient. As long as I don't have to move my arms.
I used to have one of the old thinkpad external keyboards - http://www.notebookreview.com/notebookreview/lenovo-thinkpad... - and I used those until they broke and I couldn't find more.
I haven't used the unicomp ones, but I can wholeheartedly recommend the shinobi.