Also just to add since your getting 4 H25's the HR 34's only allow 3 remote rooms streaming at the same time.
In other words all 5 rooms can't watch a dvr recording at the same time, Only 3 of the H25 and the HR34 can. The other H25 room with have to wait untill one of the other REMOTE rooms (H25's) is watching live tv, or is not in use.
May not be a problem with you, just keep that in mind.
With 5 rooms you can all still record at the same time, Just remember the HR 34 will not be able to watch Live tv if all 4 of your remote rooms are recording as well as your HR34. Again most likly rare!
But your 4 H25 will never have interuption watching live tv.
To solve these problems when I upgraded my SD receiver to an HD one, (Before the install) I went with another HD DVR on top of my HR34. I don't share the Hr23 with any rooms, (you can if you want) But I can still watch anything I want off the HR 34.
If you do get another HD DVR , you can't tell the HR24( or any DVR) to record to the Hr34, and vise versa!
Do not get talked into the HR 24 for your Whole home DVR!
You will not be happy using this in a 5 room system!
The HR 24 will only stream to 1 remote room at a time and only 1 room can record at a time without interrupting live tv on the HR24 .
Spend the Extra $99 on the HR34. Money well spent!