Re: New computers
I'm with K-Strider, my previous school was almost 100% NS Optimum machines and we had very few problems. a few PSU's every now and then but that was about it, they sent them and I fitted them so was only a day or two down time.
I've had problems with Dell in the past trying to get parts for machines, you're ok within the warranty but afterwards it's a nightmare.
I'm currently using my persuasive powers to get NSO on board here... we've currently got the dreaded Research Machines.. AGGGGHGHHHHHHH. it's not the machines so much as the software :(
good luck in what you decide.