Direct TV wants to upgrade my box in one of my bedrooms from a SD box to a HD DVR box to extend my contract. Currently the tv is a SD but in the next month or two I'll be upgrading it to HD(which is the reason I'm getting an HD DVR and not a SD DVR). So what is the best way to get the newest box(I believe the newest one is HR24?) and not an older box? When he calls in the morning should I just ask him if he has a HR24 and if he doesn't reschedule the install? Also replacing a SD with a HD receiver, is that just a replacing the receiver or does he have to run wire too(I currently have two HD DVRs in my house and i'm not sure if that matters.)?