What computer is right for me?

[Computerhelpneeded]

I'm looking to buy a computer that can run: MS Office, Autocad, Vivian, D-tools, Adobe photoshop, an Audio Visual editing software and should accommodate future growth for similar software. It would be connected to a server and have internet access. It should also be able to have a firewire connection. What should I buy?

 

[hang-the-9]

What's your budget? Speed and work level needs? Do you use AutoCAD as a pro or just playing with it?