I know of Surly's Nice Rack, Jandd's (how do you pronounce Jandd anyway?) Extreme, and Old Man Mountain's Sherpa (not counting the Cold Springs because it's out of my price range). Are there any others? I'm going for a platformed rack because it's more useful, not just when touring, but all the time. Also, I'm going to be making my own panniers, and I'd like front panniers that can hold a sleeping bag, tent, and thermarest. I'm not sure if you can make bags big enough that fit a low rider. Also, I'm not too sure about the OMM, because it has such a short platform.
Or, there's the budget option: the Pletscher 2B or 4B. Can mount on front (or back), has a limit of 55lb. I know people don't usually use it for touring, but pretty much all I'd have on it would be my sleeping bag, tent, and thermarest. I think it would work, but I'd like to know what all y'all think before I do something stupid ;-)