Although I now hate slayer, I still endorse it as a good way to train combat. Get it up to at least 65, if you havent' already. It opens up quite a few good monsters to train on. Otherwise, for melee, pc, or my personal favourite, dagannoths under lighthouse. For range, powerrange with bronze arrows at caged ogres. Mage, don't fight, alch. Buy some dragon bones and ecto your way to 52 or 60. These are my personal opinions and preferences.