Build me a pc .. but no just any old gaming pc i want a specific pc built and designed for autocad and running 3d visualisation i want to prove a guy at work rong about Hp computer ripping him off with his they reacon it cant get better and im sick of my pc lagging out ever time i try and draw an object so please help me =]

Not sure about ATI's solution to slow-time rendering but if you are a NVidia guy, you'll want a Quadro. Maybe look into a Server-Class CPU too. Depending on what you are going to be doing in AutoCAD a PhysX may prove useful too. Watercooling would be a big help, because the temperature is going to get pretty high in that case.

Don't know if they sell them in Aus, but a Samsung 3032bw is a great monitor for the price, but if you REALLY want quality you can get a photography-class monitor. They will heat your house at the same time as output :p

We need to know the budget first though. Nothing that I have mentioned will come cheap.

roughly around 3 grand would be best mayb less depending and i want duel screen 22" i use Civil 3D which is road, sewer and stormwater creation