Help Building Workstation For Autocad 2013 Revit 2012

[noobp3]

I will be building a new workstation thats fast and affordable that can have multiple windows running:

Autocad 2013
Revit 2012
Adobe Creative Suite 6
Microsoft Office 2010
Adobe Acrobat Pro
SketchUpPro

All suggestions welcome.
Thank you

 

[g-unit1111]

What kind of budget are we working with here?