As mentioned previously, Robot Jox is an all-time favorite of mine from Charles Band's extensive catalog of productions. It's from camp-master Stuart Gordon, and it lives in this bizarro future world in which "war has been outlawed" so all political disputes are settled in the ring...the giant-gladiator-robot-fight-to-the-death ring! Imagine Transformers, but without any transforming. A few other of Bands' productions mingle in this giant robot future, including the equally ridiculous Crash and Burn, released shortly after RJ.
buy Robot Jox here and Crash and Burn is currently only available in various set from Full Moon, one being here, which includes Head of the Family!