That question is also asked as:
WTF computer do we buy for Revit 2011???
(Added April 2011: Now that 2012 is out go here: Whats the best computer to buy for Revit 2012)WTF computer do we buy for Revit 2011???
I have gotten that question so much and expect it more so here goes... If you want to know what computers the experts recommend to buy for Revit 2011 I'd suggest the following as guidelines... As to manufacturers, that is more personal and let's not get personal here :-)
My recommendations:
OS = 64bit Mandatory
RAM = 16 GB Recommended; 8 GB Bare Minimum
Processors = Dual 6 Core Xeon Get the job done fast...-OK Dual Quad Xeons are OK too...
Video Card = 1TB, (I meant GB...Doh) If it's on the list below
Screens = Two 24" flat panels (Yes 2 monitors for everyone!!! even for support staff, etc... this boosts productivity 20 to 50 percent!!!)
Workstations: Autodesk Revit Architecture System Requirements
Use the ADSK recommendations above and consider them as a baseline for your options... meaning if you can afford more then you should get more; how much more? As much as your budget limits allow... Do I want to have this machine for more than a year (or two if we're lucky)? That is always the question I ask myself; because software is always pushing computers, not the other way around.
Video Cards: Graphics Hardware List
Get the "Supported, Recommended" video cards or choose others at your own risk.
SURF ABOUT IN THE NUMEROUS ADSK DISCUSSION GROUPS or THE AUGI FORUMS to see (or actually search for) even more...