RE: Introduce yourself here!
On the hardware level, I just have a new laptop and my old one so I can set up anywhere..3 screens seems like overkill...overkill that I would love to have that is- I'm not sure about running that many screens but I know that my old laptop 4gb memory and 4 yr old standard hp graphics card had no problem running any size single screen. There are a lot of options with graphics cards these days but if you are not really into gaming or 3D then you will probably be just fine with the standard one that comes with any system you pick up. About the 3 screens however, you will probably need to pick up another card for them to run well. Some however, can run 3 screens.
Other than that, I believe there is a thread on here dedicated to the software but I personally use prorealtime (like you only EoD but my favorite by far), chartmill (which I like for its "effective volume" indicator and the ability to set up a whole list of charts on a single page), and scottrade/optionshouse platforms (not great by any means but trade through them...). There is also freestockcharts and the ones you mentioned. As for paid software, I know isatrader (with his nice lists and breadth charts that he creates) could surely provide a better answer than I could as I forgot the software he uses but it is out of UK.. I get by with using a combination of any of the above as you can find different indicators and features on different software..but, it does make for a lot of research and flipping back and forth. Have fun setting up! Jealous-