greenriver said:
they would be used for xc/trail and i weight 180.
Do you value simplicity and want a low cost brake (and don't mind a little more weight or adjusting for pad wear) The Avid mech would fit the bill nicely.
Do you have aspirations of XC racing (or just ride like it) and want light brakes (with reasonable performance and reliability) Either the Hope Mono-Mini or the Magura Marta are very light and both are reliable (the Hope a little more so) but are kind of tedious to install and align (shims and brake mount facing are normally required)
Avid Jucys and Hayes brakes are extremely easy to install (the avid more so) and are reliable stoppers with minimum maintenance requirements. A good value and reasonable (if not ultra-light) weight.
If you want the ultimate performance in an XC brake, the Hope Mono4 quad piston brakes would likely be at (or near) the top of almost anyone's list. It is extremely reliable and maintenance free. But it ain't cheap, and it's not an ultra-light like the MonoMini or Marta (and the installation complexities of a direct mount brake apply.)
And of course there is always Shimano. Their brakes are like everything else they make, they work well. They are not a great deal but not horribly overpriced either and generally (and not so gently sometimes) push you into an all Shimano system. If you like Shimano's new single lever shifting/braking system... they are the no brainer.