2. Dvorak (use a typing tutor (like ten thumbs if on OSX))
3. Kinesis (not needed after 1 and 2 are fluent)
Almost left computing because of the pain, but after heeding the above 3 points, I'm back at 100%. No pain, and to top it off, I type faster. Win-win situation :) Oh, and get up and stretch every hour or two. If back pain is an issue (compressed L4 here), then get a desk you can stand at, and a comfy architects stool.