Longjack,
Just a note of caution here, based on your stated plans which appear to be future plans and not your current installation order. You need to be aware of some constraints on D* technology. If you get the HR34 (with 5 tuners) you will need what is called a SWM setup. If you only have one other receiver (one tuner) in your order the installer will install the standard SWM head on your dish. The standard SWM LNB supports up to eight tuners. Each of the other D* HDRs have two tuners and each receiver has one. If you implement your plan to have two more tuners and another DVR you will have 9 tuners on your system (HR34=5, HRx=2, Hx=1, Hx=1). That in turn requires that you go to a SWM-16 setup. Unfortunately, the SWM LNB cannot be upgraded to SWM-16. So, you would need to have the LNB removed and replaced with a standard LNB and a SWM-16 box. That will also require an additional line to your distribution center.
So, either you need to have your whole system setup now, drop one of your desired tuners, or maybe skip the HR34 installation for now. Only you can provide the right answer here. But, it is important to know that what you plan to do will have implications on what might need to be changed in the future.
As for the line to the other side of the house, just know that total line lengths greater than 100 feet seem to come with issues. You just need to be aware of this. I would imagine that the installer will do what needs to be done to make it work.
As for Whole Home DVR, absolutely, especially if you go for the HR34 option.
Bob