I'm going to be adding an Avid BB7 front disc to the new XC bike I'm building. I'm a 185 lb rider, and don't ride super aggressively. However, I do like to do some technical stuff, and also enjoy bike camping (where I might be carrying 20 lbs in panniers).
There's little price difference in the Avid BB7 series, as about $30 is all that separates their 160mm brakes from their 203mm brakes.
Any reason NOT to go with the 203's, or would that be overkill for someone not riding DH or FR?