I've played live with only a 112 cab for a couple of years. Before that i had a *Prometheus 110 combo (wish I hadn't sold that, it was ace). I've always played through the PA too so, to me, no point in carrying anything bigger. It helps that the band like to get a good onstage sound, i.e. not too loud, meaning I've never pushed the amp or cab.
*Promethean