FfEL

I am looking to buy a new laptop. I work on alot of graphics programmes including the new Photoshop CS4 and AutoCAD 2009. I work with large files and want to buy a laptop that's going to be able to cope with these file sizes.Any suggestions on the processor/RAM I should go for?With my old laptop it was extremely slow at times and I often had warnings like 'low virtual memory' and 'scratch disks full' etc.Help?!