Yea but some are missing the point here. Its fine if you can run a ok computer with dual display, for, say, photoshop OR illustrator OR Maya OR 3dsmax etc etc. . .
BUT
LET ME see you run them all at once, which is usually what is required for much digital work. I always have illustrator, photoshop, frontpage or dreamweaver, and flash, perhaps premiere open all at once to multitask different things at once, which aides in getting form over function complete.
See, you need a powerfull graphics card, one which is stable, and will function as a performer with enough ram and dual display. I HIGHLY recommend a quadro 4 550 for around 200 bucks. I know the QUadro 2 pro's without dual display are going to around that even, so its a good deal right now. A bare minimum processor speed would be 1.5 GHz. Why bother for less? It costs only a small amount to go up these days. Think longevity on this.
I mean, a computer like you envision, being simple, dual output, 1 ghz, 512 ram, etc, will work, but what happens when you want to run all the programs. . .at once?
I know when once may want to jump to the 3d world, its nice to have enough ram and processing power to handle a render queue, and a photoshop EPS file for credits, all at once.
-Steve