I'm looking to build a PC that is just a notch or two below the current top specs. I would get a Mac, but it's not worth the money. Here's what I've come up with (all from tigerdirect.com): Intel 975XBX2KR Motherboard CPU Bundle - Intel Core 2 Quad Q6600 Processor 2.40GHz OEM Ultra Gladiator ULT33181 ATX Mid-Tower Case - Black, Front USB, FireWire, Audio Ports, 500-Watt V-Series Power Supply Ultra 1024MB PC5400 DDR2 667MHz Memory (x4) Seagate Barracuda 7200.10 500GB Hard Drive - 7200, 16MB, Serial ATA-300, OEM EVGA GeForce 8600 GTS Video Card - FREE Enemy Territory: Quake Wars PC Game, 512MB GDDR3, PCI Express, SLI Ready, Dual DVI, HDTV, Video Card I will also move a few things from my old PC: Sound Blaster X-Fi Platinum Sound Card (PCI) Seagate Barracuda 7200.10 Hard Drive (PATA) DVD-ROM Drive DVD+RW Drive This would be my first build, so I have a couple specific questions. First, how close is this build to the 500W limit of the power supply? If I wanted to add a few things, would I need a larger power supply? Second, I plan to install Microsoft Windows Vista Home Basic 64bit FULL. The motherboard description says that using a 64-bit system allows me to upgrade to 8GB of RAM. Can anyone explain this? Do I just install 2GB sticks with identical specs? Also, I have read that a different BIOS is needed for 64-bit systems. Will I need to flash the BIOS before installing Windows or will it support a 64-bit OS from the factory? If I do need to flash the BIOS, how do I know which BIOS I need? Any other thoughts, recommendations, and feedback are extremely welcome. Thanks!