I'm looking to buy one of the Sapphire Radeon 9800 cards. I noticed that there's a $30 difference between the pro and non-pro variants. What are the differences and what is the extra $30 covering? For simplicity, let's just say I'm buying the bulk version. To add to the details, I'm upgrading so I can play Half-Life 2. Any recommendations for video hardware that fall below $250 are welcome.