The standard install for two rooms with a DVR is a 625. The 625 outputs to two rooms and both rooms can record and playback from the DVR. This is probably sufficient for what you're wanting, once you understand how it all works. In "dual" mode, each room has access to one of the tuners and can playback any available DVR events. "single" mode is a more advanced mode that dedicates both tuners to the same room, allowing you to record and watch 2 different things at the same time, and use the PIP function.
To add another receiver in the 2nd room will cost you an additional $5 monthly, or $11 if it's a DVR. If you do this, then it's two independent receivers, you can't watch recorded stuff on one DVR from the other one in that case.
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