Sata Or Raid Controller And Network Card For Whs 2011 Vail

Hi,

I just finished building my home server. I was wondering which Sata/Raid Controller and Network Card would be perfect/compatible with my system.

This is my system :

Asus P5Q
Intel Q9450
Team Elite 4GB DDR2
GTX 260

1. I need a Sata / Raid Controller Sata 2 with 4 ports which is compatible with my system. I did try searching in newegg. But I cant seem to find a card which is compatbile or I just don't know what to look for.

2. I also need a Network card with 2 or 4 Gigabit RJ45 ports. I just wanted to have extra for ports for traffic balancing / faster transfer. Am I right with this one?

3. Do I need to upgrade my RAM to 8GB?

Thanks,
Karl