I've used the 70-200 for wrestling, and when you are matside it can get too close. Moving back subjects you to people crossing your shooting path.
Light tends to be a problem in most gyms. Tournaments held during daylight hours often have better light if there are skylights to let in some natural light. Otherwise its usually dismal and requires at least 1200+ iso to get the shutter up around 250.
I've had some great results with the 85 1.8 lens. The extra light helps a lot with shutter speed and iso. The trade off is of course that you're more limited on field of view changes.
Wrestling is a very tough sport to shoot well. The action can revolve around 360 degrees, and you have no idea at what point to position yourself other than for the starts at the beginning of periods. I have lots of pictures of wrestlers backs and behinds. Add to that the fact that when they are on the mat instead of on their feet, most often their heads and faces are facing the mat, and not the walls. It all makes for a difficult sport to shoot well, especially with a single shooter. If you had three people working the same match from even increments of 120 degrees or so, you'd get a lot more good shots, but I haven't figured out a way to clone myself yet.
A perfect lens might be a 1.4 60-120 zoom, but I think there are cost and other physics optics problems with producing that lens.
50d, 70-200 2.8L IS, 24-70 2.8L, 85 1.8 USM, 17-85 IS EF-S, 50 1.8, 430EX.