Don't use wrist braces - they're for immobilization, not pain mitigation. If you need to persist in the same activities (and you really should look into PT), the ACE bandage wraps are the best to "offload" stress: http://www.walgreens.com/store/catalog/Braces-and-Supports/A...
You don't want the heavy velcro braces: again, they're for immobilization, not for pain mitigation.
I would disagree about not using wrist braces; my doctor recommended I use one when I was experiencing wrist pain several years ago, and it helped a lot. A lot of RSI conditions are caused by pinched nerves, and the immobilization of the wrist prevents the sort of bending that leads to pressure on those nerves, allowing it to slowly be relieved over time. They don't help mitigate the pain, they help treat the cause of the pain. It helped me to wear them while working, but I also got a lot of benefit out of wearing them while I slept, ensuring that my wrists were perfectly flat and healing.
You don't want the heavy velcro braces: again, they're for immobilization, not for pain mitigation.