Help me out here guys. I've been a PC user all my life (built my first machine from scrap parts when I was eight years old). Don't get me wrong, I've drooled over Mac's for years, but aside from my white MacBook, all of my machines I've hand built and take pride in. Well, I'm tired of Windows. I'm tired of all of the little things going wrong, and I'm tired of things just not "working." I'm ready for a serious Mac Pro with hardware interface acceleration, an interface that wasn't designed by monkeys, and hardware performance worth writing home about. Except, I'm a graduate student in mechanical engineering. Money is tight and there's no way I can plunk down thousands of dollars for a new 8-core Mac Pro, so my only option is to go used. After searching for a while, I found someone selling their used 8-Core Mac Pro (3 GHz) with 8GB of memory. They want a little over a grand for it, although I am hoping I might be able to talk them down. Is this a good deal or should I be looking for something else? I use my machines for engineering models, so compute performance is something that I would like to have, although this machine will also be my daily machine. Do you guys have any recommendations, both on this machine and on anything else? I am speaking strictly about Mac Pro's, I'm not interested in iMacs, Mac Book Pro's, or other machines. Thanks! Edit: I should mention my current PC is an i7 920 (2.66GHz with 6GB of DDR3 RAM).