I'm not alone in my mechanical keyboard madness. Arstechnica posted a good video about ergonomic keyboards. Their recommendation? Mechanical switches and a split layout.
I'm really enjoying the Kinesis Contoured keyboard. The wrist pain I was experiencing has disappeared. I only wish I had a second one for home as it is now uncomfortable to go back to using the MS Natural Ergonomic - the rubber dome keys require a lot more force.