The Kinesis Freestyle solo is a low cost split ergonomic keyboard.  It allows you to detach each side and position it independently.

The goal is to have each wrist on top of the keyboard without twisting the wrist.  Everyone has a slightly different distance between each hand, so this allow independent positioning.

Office Master makes the Discovery DB96 computer chair that I use.  It has a unique pear shaped back shape that forces me to sit correctly.  It is also fully adjustable.  Check it out at your local store.

Office Ergo has some tips for selecting computer seating. Key elements to look for in a new chair:

1) Adjustable Seat Height

2) Seat depth Adjustability

3) Backrest height and angle Adjustability

4) Chair Recline

5) Seat pan angle Adjustability

6) Lumbar support and Adjustability

I have had problems with arm rests in the past.  Typing with arms on an arm rest lead to problems.  I ditched my arms.

You may need to goto a computer chair or ergonomics speciality store and not an office product super store to find your optimal chair.  Try a chair before you buy.

There are many RSI support groups around the nation. I have attended the San Francisco RSI Support group and found it helpful. They have monthly sessions with knowledgeable speakers.

It is always great to learn new things, share tips with others, and realize that you are not alone in your recovery.

RSI Warrior is a software package I have used to fight RSI.  It brings up rest break reminders, stretches, ergonomics tips, and automatic mouse clicking.