Tigerdirect is kind of Pricey.  I usually use eBay or Newegg.com.  For case I really do recommend the Antec 1200.  It's cooling is great, and it's a very high quality case.  Not to mention it looks cool. :)I was originally going to do 2 4650 video cards, but I found the 4870x2 was faster and a bit less expensive.  Another advantage to eBay.  Depending on who you use, normally no taxes."