I'm thinking about upgrading my service/equipment to HD. The receiver I'm looking at is the one with the built-in HD DVR. I noticed DTV has a $4.99 monthly lease fee. If I'm replacing an existing receiver with an HD receiver, is the $4.99 fee already covered by the lease fee I'm currently paying for the receiver I have now? Is there anything else I should be considering before I decide to upgrade? What are the pros and cons (if any) of upgrading besides the obvious things?