Congrats! I just built my first one just a short time ago, may provide some pointers:
http://forum.calgarypuck.com/showthread.php?t=88019
As to your questions I'm no expert yet
2. I picked up this one, seems to work great:
http://www.newegg.ca/Product/Product...82E16813128435
3. If you're not doing gaming, I would say dual 22" for the multitasking.
6. I'd say get 4gb.