OK... Hi

This is my first post, after lurking for quite a bit; mainly about this topic.
What I am planning to have is an in-expensive HTPC with Blu-Ray and a big server. Big as in maybe 4-8tb.
I'll post what I'm kinda planning to use for components then..
Server:
JetWay JNC93-330W-LF Intel Atom Dual-Core 330 Intel 945GC Mini ITX Motherboard/CPU Combo
Antec 300 Case
4x1TB Caviar Green
General bad hardware for a server.
HTPC:
Basically the same but different case, and like a 250GB hdd.
Blu-Ray read drive
Now the server is going to stream to the HTPC, both will be connected with cat 6 wire. So I will need a Gigabit network card for the two builds... any recommendations?
Ok now about front end... I'm not sure how it works.. Under the My Video's bit or whatever in the front end, once you play it does it then open up something like VLC..? Could I get it so it has like a BBC iPlayer section in the front end, you click through there and then it opens up iPlayer? Same with Spotify?
Thanks in advance and sorry about this just being like a bunch of questions together possibly not making much sense
Kookie