Does anyone have a recommendation on what brand of rack to get for a mountain bike? I'd something that can hold panniers, but it also needs to have something to keep it from breaking with all the bumps. I won't be doing anything too off road, but theres about a quarter mile of dirt trail that I'll be using everyday to get out of the house.

For older mtb with rack-mount bosses on the frame, pretty much any standard rack should work.

If you have disc brakes, you will have to make sure you get a rack that will fit around all that stuff.

If you don't have mounts on the frame, then you may have to jimmy something up with P-clamps

For a compact frame with steeply sloping top tube and seatstay tubes, check out the Bontrager BackRack S. I've used one for nearly two years on my compact frame bike. I mostly use it for errands and it holds up to 50 lbs of groceries and other stuff, no problem, even over miles of bad road.

Unlike many racks the BackRacks use tube supports rather than flat spring steel to secure the rack against the seat tube or seatstay tubes. While this isn't important with standard frames -- the flat spring steel supports are usually only a few inches long -- with compact frames with long sloping top and seat stay tubes, the supports must be up to 12" long. With the BackRacks the support tubes are made from the same sturdy tubes as the rack itself.