The BEST paper I've found is...
just plain ole' wax paper. It comes in a roll, you can find it anywhere, it's thin and it's cheap. Because of its thinness (is that a word?) it shows tear details much better than any other kind of paper I've tried. You'll need a fixture to stretch it across, but other than that I think it's the best paper to use. I just spent 15 bucks at Home Depot and bought 3 8-foot sticks of 1-1/2" pvc pipe plus some T's and elbows and 4 carrige bolts, 4 washers and 4 wing nuts and made my own freestanding paper jig. I got the idea for the stand from someone here on AT. I'm sure the post is still around here somewhere.