New here. But I hope I'm not treated like a baby

I've switched over to Ubuntu and am getting more and more comfortable not using windows. I am now plunging into LinuxMCE. I have a current system I built around WindowsMCE. I'm waiting for LMCE 7.10 before I attempt an install.
The system I am using right now is made of this:
Intel 6600 dual Core CPU
Gigabyte P35 DQ6
2 GB RAM
Silverstone Grandia Case
Gigabyte 8600GT
BTC 9029URF Wireless Keyboard
Logitech MX revolution mouse
Onboard Realtek RTL 8168B/8111B Gigabit
Onboard Realtek HD Sound
I am thinking of using the above system for the Media Director PC.
I have looked through most posts on the web and the wiki. Here is the hardware I have picked for my Core Server.
Core:
Mobo:Gigabyte GA-P35-DS4
HD for O/S install:320 Gig Seagate (overkill I know, but it's lying around)
HD's for media:Seagate 500 gig (.10 series) X 4
CPU:Quad core 6600 LGA 775
Case:Antec P182
RAM:Corsair 8500C5 2GBDDR2-1066
DVD Drive
Power Supply:Corsair 620
RAID 5 Card:AMCC/3Ware 9650SE-4LPML
I need advice for the following items:
2nd Gigabit NIC card to serve the house
Graphics card
TV tuner Card (recording Digital TV)
What do you guys think so far?
And of course if I can get all this hardware working together, I will update the wiki Wink