We want your HALO 3 screenshots here. Add yours.
The Hushed Casket was founded in 2002 shortly after the launch of the XBOX console. Today the Hushed Casket is a thriving community of gamers, playing together and publishing news and stories that have appeared in major media properties like Newsweek, G4TV, USA Today, and Penny Arcade. Some game developers have even referenced our guides and news to support their gamers. We don't play Halo. We LAN Halo.

Get notified of game nights and important THX announcements via the hushedcasket Twitter account. You can get the messages on your cell phone, through email, Facebook, and many other ways. Here's how it goes down.
No one says you have to buy
No one says you have to buy everything at once, so here is what I came up for you. If I were to build a really nice pc this is what I'd do:
Intel 2.66ghz dual-core
4 gb ram
500 gb hdd
8600 GT
600 W power supply
The total comes to 887.26 shipped...you could easily downgrade a few things and get it down to your $800 level. This would be a very solid rig for what it sounds like you need it for. What are you planning to use for your OS? XP?
All this pc talk makes me wanna upgrade from my p4, 1 gb ram, 250 gb hdd...