What type of hardware should I purchase?

Hey kids. I'm undertaking a project in the next month that will entail many months of VERY intensive animation and rendering, in flash, swift3d, and a third party video editor (most likely after effects). With my current setup, rendering long passages of 3d animation can bog down my computer for an hour, which when you're under the gun can be lethal to time and productivity. All this to say, I'm going to invest in a top-of the line pc. I understand that I'm going to have to drop a few (or several) grand to accomplish this. Can anyone give me some reccomendations? I'd prefer to stay with a brand that's easy to upgrade and understand (such as Dell). Can I anyone point me in the right direction?
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