I am on a 700$ budget.(excluding the 100$ for vista 64-bit) I am just about ready to purchase several parts to this PC, but I needed some help with a few things first. First, I was just wondering, is all of this hardware compatible, and do I have everything I need for it to run smoothly? Second, I haven't yet decided on just a few of the parts that I need. I don't know which video card I should get, they are listed below, but all of them seem pretty good (yes I do realize that both of the radeon cards are the same, but one company might be better than the other, who knows?). I am open to suggestion, so if you have one just post it. (Although if you do suggest a change or something of the sort, please provide a link to where I can get the part) SAMSUNG 22X DVD Burner Black SATA Model COOLER MASTER Centurion 5 Black Aluminum Bezel, SECC Chassis ATX Mid Tower Computer Case Western Digital Caviar SE WD1600AAJS 160GB 7200 RPM 8MB Cache SATA 3.0Gb/s Hard Drive CORSAIR CMPSU-550VX 550W ATX12V V2.2 Power Supply GIGABYTE GA-EP45-DS3L LGA 775 Intel P45 ATX Intel Motherboard Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory XFX GeForce 9800 GTX(G92) 512MB 256-bit GDDR3 PCI Express 2.0 x16 SLI Supported Video Card OR SAPPHIRE 100242L Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card OR MSI R4850-512M Radeon HD 4850 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card Microsoft Windows Vista Home Premium SP1 64-bit English for System Builders 1pk DSP OEI DVD Also, I am a first time builder (I have done a few small changes, such as RAM or a video card, but nothing like this), so if you can, please post a link to a good guide that can help me put this thing together. Thanks for your help.