You could use the WoW system where if everyone on one party has that quest, they all recieve the quest reward. Therefore, if your party is going ona large quest no one is left with nothing as might happen if there is onlt one reward. Also, though, maybe they should have different rewards for smaller and larger parties because a smaller party worked harder and deservs a better reward for their efforts. They could have like Quest Reward: 1-3 in party=(some really good item and money) 4-6=(a good item and less money) 7-10=(an avrage item and some gold).