Its usually a better idea to not to set a priority to to anything under 40 otherwise your going to be starving bandwidth to the rest of your network with very little gain to the connection of concern. dd-wrt has some good papers writen on QoS and the subtlties. Also, its better to give different traffic coming from your PS3 different priorties. I go 5223 to priority 50, 3478 / 3479 to 55 and 3658 / 3658 to 60. Thats because 5223 is for its Multiplayer, while 3658 is just the authentication into PSN.