You've posted this in the wrong forum.
Since this computer is going to be used mostly for gaming and video editing, you may want to look at the ATi Radeon 9800 Pro All-In-Wonder video card.
Look at ASUS or INTEL for the motherboard. There are many good choices from these two companies.
Get name brand RAM, not generic stuff.
You'll want a big hard drive (or 2) because of the video editing. Look at Maxtor or Seagate for those.
And make sure you get a good quality power supply to avoid power related problems.
Cricket