My recommendation on barrels would be either the Broughton 5C's or the rock Creek 5r's. I would probably go 9 twist with Broughton and 9.5 with the Rock Creek.
Barrel length....28-29" you could start with 29" and then move the chamber ahead once the barrel is loosing accuracy.
Contour.... I kinda like the Palma contours as they have a little more length of straight cylinder on the breech end which allows the barrel to be set back a few times. The number 5 contours are also good contours.
Muzzle brakes.... Of course since I make muzzle brakes, I'm going to recommend my own [img]/ubbthreads/images/graemlins/grin.gif[/img] but the D.E and Holland brakes are also good quality brakes.
I also offer my "V" brake in .875 and 1. I can match barrel contour in between sizes without changing port sizes for no additional cost. Here is a picture of a "V" brake I just installed on a rifle with a muzzle dia. of .890