Our graphics lab contains 20 Apple iMacs (20-inch) with Intel Core 2 Duo Processors running OSX 10.6 (Snow Leopard). We recently upgraded to 8GB of RAM (from 4GB). We have a color laser printer (Xerox 6360DN), scanner (rarely used anymore), digital camera, and backup capabilities on a Windows-based server. We are due to replace computers after this upcoming year. Any suggestions for future purchases?