My brother wants us (me) to build him a computer to run Revit on a relatively low budget. I can get a Z68 MB and i5 2500K pretty cheaply right now at Microcenter. Does this make sense for a processor cost of under $200 or should we be looking at an AMD X6? We plan to use a Quadro 400 video card, 8-16 GB of memory and Windows 7 Home Premium 64 bit.