I sit here listening to my music in the background. I'm in a Pharaoh Sanders mood right now. Music is a great transport to clear away many of the thoughts that cloud the drawing process. It also inspires and adds it's own flavor into your work. Trust me head banging thumping and grinding is different than smooth and sweet. We are not immune to the environment we are immersed in. Nature calls, the wife calls, the cats want attention, the phone, the mail in the mail slot, the outside noise, the inside cares.........music soothes the savage beast, so I can draw. I don't want to concentrate too hard but be on that edge of vivid sleep. That is where is doesn't matter if I can't do it, I will not stop myself from trying. If I can get it roughly, in time I will get it out smoothly.
Why two PCs? First I don't have a dual quad core with a graphic card so potent-n-powerful it can be the hub of a 4 screen cinema and do the marquee too. Second I do have an older spare dust bunny generator PC that still works. If I set it up as a media player/reference display, I won't have to divert any power on my main PC to doing those things while I am drawing. Plus the second display means I don't have to page back and forth between work spaces. It's all good. Like watching a tutorial on one PC and practicing it on the other at the same time. Not so mad am I? Having pictures of some idea on one screen and you working the sketch on the other.
In your studio accommodate yourself, that is what it is for. I would like a large wide screen or a video projector. Now that's thrilling. Maybe venture into 3D graphics. Although computers can produce wonderful output, they shine in the brain assist. I scanned my notebook pages into my PC, onto CD, then I review them in slide shows. You will be surprised at what you can learn from your own work, what you can teach yourself. That program by Google called Picassa is a gem, an absolute gem. It will play each picture in a folder or selected set at the interval you choose. There is a collage tool I just discovered. You take a batch of pics and twist and layer and resize and reposition interactively.
Perhaps one day I might get an extreme hardware upgrade. Seems you can get laptops that do everything you want. Desktops seem cheaper for the same result. I rather have a light dimming desktop in my studio and a laptop that can do a lot but not be too expensive. I wouldn't want to carry around something I would have to be extra careful about. Hey look at that guy with his case handcuffed to his wrist. Must be a federal courier! Nah, that's Rno the digital artist!