Hey guys, I'm closer than I've ever been to finally breaking down and getting a Mac Pro. It pains me to no end that I'm having to spend over $2,000 as it is to get the Mac desktop I want, but I need some more expandability in terms of hard drive space and RAM. That being said, I will absolutely not spend any more than about $2200 or so, so please no suggestions of "just spend the extra $500 and get the current 8-core". Thanks guys! Now onto my question... I'm considering either a previous generation 2.66Ghz Quad core or a current generation 2.8GHz Quad core. I have a few questions about the 2.8GHz quad. Does this machine come with the same motherboard as the Octo's, just minus a CPU? Or does it use a completely different mainboard with only one CPU? This is critical to me, because the only way I could justify spending the extra now would be if it would be possible to throw another Xeon in there down the road if I chose to do so. Any ideas on this possibility? My other option would be to get a brand new previous generation 2.66GHz Quad core in which I would likely immediately purchase an additional 4GB of RAM bringing me to a grand total of 5GB. I'd also purchase an additional 500GB drive I'd throw in there too. Any thoughts on these options? I'm leaning heavily towards getting the previous generation simply because it will allow me a bit more room in upgrading RAM and HD capacity. If I go the 2.8GHz route, I'm pretty much stuck with what I'd be getting for a while. And finally, what will I be doing with this monster? I'm a budding Systems Admin, and I'm going to be using it to become familiar with and learn the likes of Windows Server 2003, Windows Vista, and eventually Windows Server 2008.