From what I've read this one is amazing. Not sure I want to drop that much cash on a keyboard yet though. Plus I've seen some reviews about it being a fixed layout as a downside (and some reviews where that is an upside).
It's a tool you'll use 8 hours a day for years and it will reduce the strain and potential for injury you risk by doing so. The cost is irrelevant in the long run. It's a high quality keyboard with mechanical switches that will last until you're tired of using it for some reason.
I've got a version 1 I've been using for many years that now lives at the office and a version 2 at home.