I'd recommend some avid codes. theyre supposed to be be sick, most of my riding mates have em and they seem to love them! Either codes or saints i think!
Go for the Hope Tech m4's - i upgraded from formula the one's because they were just always noisey and poor stopping to Hope Tech m4 with braided hose and floating rotor and 203mm front with 180mm rear BEST BRAKE EVER
I have Saints right now on my dh bike but my FR has code 5s and i love the codes so much more. saints are very nice but not quite as much power as the codes. i have not riddin the elixers but have heard lots of good out of them. pretty much anything shimano will work. hope would probably be your best price to value option.