So you realized that your typing surface is too high. You have 2 options: 1. Lower your typing surface. 2. Raise your seat. #1 can be handled with a clamp-on

So you realized that your typing surface is too high. You have 2 options: 1. Lower your typing surface. 2. Raise your seat. #1 can be handled with a clamp-on keyboard tray (get one with negative tilt), and for #2, try a drafting stool (don't buy until you sit on it yourself). I had the same problem. For my office, I have both the tray and the stool, and for my home office, I just have a normal chair + a rolling adjustable desk surface that goes low enough to be used as a typing surface. I also use a split keyboard (Kinesis makes great ones) and I'm in the market for a vertical mouse right now. Don't listen to the people who say ergonomics is all bullshit and you just need to stand up (or exercise or whatever). Your equipment makes a difference.