DO NOT BUY A PC THIS WEEK.
At least, if you have any intentions of upgrading to Microsoft's Windows 7 operating system this. Leaked memos from Best Buy suggest that PCs purchased after June 26th will get the free upgrade to Windows 7, when available in October. That's a $110 value.
Better yet, wait a month until the best-prices-of-the-year back to school season starts in July, with a new set of products.