I am considering the purchase of a new or used mac mini to use as a server for Extensis Portfolio image cataloging/database and light office use. Have never used one and don't know much about them, especially old models. Can any take more ram? Will graphics be as good or better than an early 09 dual core macbook? Will there be problems leaving the machine on 24/7? The mini will be on a LAN and working with a Mac Pro 5,1 running 10.7.5 (soon 10.8). It will also be accessed over fios/cable via a gotomypc connection. Will one of the mac minis work for me or should I be looking at another used Mac Pro or iMac? Thanks for any answers.