Hi. I'm building a PC. Case: Rosewill Blackbone ATX Mid Tower Motherboard: ASUS Sabertooth 990FX Processor: AMD FX-8120 Hard Drive: I have an old 640GB hard drive sitting in an old gaming computer that stopped working for some reason (you can see the system specs on the left, under my username. It always had stability issues, but I'm not smart enough to figure out what is wrong.) RAM: G.SKILL Sniper Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) or G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) I don't know which is better -- they both sound like they work just fine with my motherboard. Video Card: I am trying to select the best possible Radeon HD 6870 for future Crossfire use. This appears to be the best rated option on Newegg, but I was hoping that someone could either explain to me why it merits the extra cost, or show me a viable alternative for around $170. As far as a power supply goes, I am pretty much in the dark. I saw these: Corsair 650W and Corsair 850W but I don't know if 650W is too low and 850W is too high. Also, the pricetag on the 850W is a little out of my range, but if I need something that strong to run Crossfire, I will get it. I already purchased the CPU & Motherboard from Microcenter because they offer a great deal on my motherboard. So right now my budget dictates that I can afford: 1 Radeon HD 6870 ~$50 case ~$100 PSU 8 Gigs of RAM but eventually (in about 2 months) I would like to add an additional HD 6870, Two 1TB HD's in RAID 0, a SSD, 8 more Gigs of RAM, and a swanky CPU Cooler.