Query: I now have a Dimension 2350--Premium 4CPU 1.8 GHz. I have added Ram to 768 MHz. It is now about 9 years old. It has a failure of the heat sink clamp and I need to replace. I would like to know what new models (tower) that are similar in layout. [ports, hardware slots, size etc.] I want enough hard drive, ram that would be useful for several years.