I need advise on setting up a DVB-Server !, tuner, server, network, dvb-s, Options

[Networkguy]

Hey guys,

My name is Bent, and i'm from Holland. I really need some advice;
(Please forgive me for my bad English, I really try to make myself as understandable as possible!)

Me and my parents just moved into a new house, and it is my job to arrange all the tv stuff for my parents.

The thing is, that I can only receive sattelite TV at the place we live. We do want 4 rooms to have TV however, so I did some research, and id seemed to me that the best thing to do is to build a TV-server with 4 tuners in it, and hook it up to a quad-lnb sattelite dish, and place a small HTPC next to every television. ( The other option would be putting a standalone HTPC or decoder with every television ). I choose for the server option because I dont have a home server in my network yet, and next to running the TV software, I could also use it for file sharing, small mail server etc. At the moment my network is 1Gbit double duplex, so transmitting speeds will not be the problem.

I want to be able to use card-sharing, and receive as much HD-channels as possible. (And as much pay-channels as possible, preferably without paying monthly fee, I heard this is possible with a dreambox, but I imagine that with a PC with tuners in it, I can achieve the same result as the dreambox can?

I also want the server to be able to record to other devices in the network, and stream for all 4 televisions at the same time without loss of quality.
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I'm really not that experienced in this area, so here are some things I need advise on;

What OS should I run on the server? Is it possible to do this with windows Home Server? Or would Linux better suit my needs?
How could I obtain the pay-tv? what hardware/software do I need?

What kind of tuners would you recommend?

What Dish should I use? any recommendations?

What should the specs of the server be? does streaming 4 HD channels at the same time require superb hardware? Or is it not that heavy?

What about the HTPC's next to the TV's? I want them to be able to play full HD at maximum performance. Do i need a dedicated GPU for that? Or can I get away using onboard-video?.

What software do I need? recommendations?
Other advise or tips for my project are also welcome! please share you'r thoughts with me! I really appreciate it. This Could also be a really helpfull topic, because i've searched forums for hours, without finding a single topic summing up a project like this.

Thanks for you help
Ben Smith