What headaches? Bleeding a Hybro brake is easier and quicker than changing a cable and I don't have to do it more tham once a year. Both have their merrits and Avid Mechs are a great option. I have Hope Mono Mini's and they are very nice and have great control. I do have to agree the benefit pof the disc for an XC rider is the wet braking control and the lack of V's rubbing the rim.

I would definitely sticlk with the 7's based on what I have read.