Help: on specs building a rig for Cad programs.

Hey all, my uncle wants me to build him a computer for his daughter whos taking architecture....He wants to save as much money as he can so I'm wondering what parts you would recommend...maybe recommend some motherboard/cpus..I'm located in Canada so stores like Tigerdirect.ca and ncix.ca are places i can go to for parts >
I wonder what kind of mobo and processor would be good for Autocad or programs like it..rendering images and stuff like that..doesn't have to be overkill super fast or w/e but good enough so u can still say wow...thats fast
also since its for programs like autocad..i don't think i would need to put in a high end video card either...
any help, recommendations would be appreciated!
thanks guys!

Well, to start, what is your budget?

well i just need a computer good enough to use Autocad..seriously lol but if u must put a budget..i'll..say 800$...i don't think i'll need a top of the line video card....nor top of the line RAM..i don't even think i need a dual core >_<

monitor? its vital for the price
go to Autodesk for System Requirements
take a look at the "Get information on graphics hardware certified for use with AutoCAD 2007." link at the bottom

regards

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edit
omg! just looked at "Supported but not recommended" list and found this for NVIDIA GeForce 7900 GT

lol - this guys are pretty exacting