I've been running my peer to peer network with 5 computers for a few years now with an Acer Aspire H340. I have some win 7 machines and some Macs with OS X. I need to move a lot of big files around a lot and I find with my current setup if I'm copying files and then try to do other things, the system comes to a crawl and sometimes explorer has to restart. Often my explorer shows nothing and just sits there trying to locate items. Anyway, I feel I need something more robust. I need a lot of space and a good backup strategy. If I were to go up from the Acer, what would you recommend? thanks in advance.