I'm in the BB7 camp. I've spent a lot of money building up my bike and the last thing I considered changing was the brakes. But the BB7s work so well for so much less money. Also, go read the reviews in MTBR - there are way too many problems with hydraulic disc brakes. If I paid the money it costs to buy a set of Hopes or Maguras, I'd expect flawless performance and low maintenance. Neither is a sure thing.