If I did want to build my own, what are good components?
I see people seem to be raving about Antec cases. Also, I'm guessing a good 700 watt power supply for future upgradability, especially with higher end video cards and in some cases dual video cards. Asus motherboards still seem to be a standard.
I would start with an i7 920 processor. I have a Gigabyte X58 UD5 board in my rig right now. I moved over from ASUS awhile back and I have not regretted it. You can stick any memory into this thing and it knows where to clock it on Auto. I would go with 6GB of Corsair Dominator DDR3-1600 and a single GTX 285. I am not a fan of ATI cards and I never recommend them. I think their drivers are absolute garbage and there are tons of conflicts with numerous games. I went to Nvidia with the 8800 series and never looked back. Anyway, round it out with a nice Antec full tower, 850W PSU, pair of 1TB HDDs and any DVD drive you want (Newegg has 100s). Would run you about $1400 and it would definately run this game + anything else for the next year or two.