There has been some discussion on the importance of a good chair. I find the keyboard a very important component, perhaps as much as good office furniture.
I use to half joke that my disdain for Microsoft is not as extensive as it may appear from one reading what I post (I got a -8 mod a couple days back for saying no real programmer would accept programming under Windows). In fact, I love several Microsoft products and, for me, the three best products they do today are the natural keyboards, the mice and SQL Server. In that order.
I loved the Z-80 softcard too. Would place it above SQL Server if it were still in production.