If you have an E100 brain fork, it's a top quality fork, perfectly suited to that bike. It's light enough, lighter than some newer forks + carbon steerer. Make sure it's fully serviced and working correctly & set up properly as per the charts in your specialized manual for the 2010 epic. it's then up to you if you want Brain fade or not, but adjusting the sensitivity of the brain.
you could go and waste money on a Fox 32SC or a newer SiD, but I very much doubt you'd see a performance difference.
spend your money on something else, or save it for a newer bike with newer geometry. I'd use what you have and learn to ride / learn your bike.