my .02$: get an ergonomic keyboard (I use the MS Sculpt keyboard nowadays), and learn to type like a pianist (use both hands, don't be afraid to move them to minimise strain).
Sculpt is an amazing keyboard for programmers who need to press a lot of hotkeys. It has short spacebars and huge modifiers, very comfortable for your thumb. Not to mention it is split, negative tilted, tented and has a built-in wrist rest.
