Kinesis Advantage. I bought one because my advisor had one. I got sticker shock. Spent a big chunk of my then salary on one. Spent a week getting used to it. After 10 years, it is safe to say I will use a Kinesis until I die. It's the perfect keyboard.
I’m surprised they aren’t more popular. I’ve been using mine for 10 years as well and I doubt a better keyboard exists. Also, they are built to last. I’m still using my original Kinesis and it’s held up perfectly, besides the finger grime.