With the prices at which the 501 and 508 are going for, your way ahead to get a 522/625 since they are about the same cost (on ebay anyways). You get two tv outputs and if you hookup your phoneline then you do not get charged the additional outlet fee. You end up with two rooms with DVR functionality and the money you save on the additional outlet fee makes up for the $6 DVR fee. If you have AEP the DVR fee is waived.