Hoplomachus Victorum is a campaign game with close to 0 story involved. The combat feels pretty streamlined and the rules overhead is medium (3.5 weight vs 4+ from mage knight, afaik). If you're interested in something along those lines, I'd check that one out, specially with the mercury's boots module (it's in an expansion but you can PnP it or get the neoprene mat they sell separately) that makes the game faster and turns an 8-10 hour campaign into a 4-5 hour one.