I am thinking about getting a front rack for when I am doing some touring. What should I look for when determining if it will fit. Steel or aluminum? Better styles?
First decide what you want the rack to do. There are a few styles:
I suggest looking mostly at low-riders, and I think the Tubus Tara is the one to get if you can afford it. In general, aluminium will be cheaper but not last as long, and racks built using both materials should weigh about the same.
If you want to build your own Alex Wetmore has a useful series of blog posts