I'm sure it's only CRTs that are dangerous, from the back and sides in particular.
If you have the money I'm sure an office supply store will indulge your paranoia.
Regarding workstation ergonomics: Whatever makes you feel comfortable. Take lots of breaks, get up for a stretch every thirty minutes. Above all take care of your arms, your mouse arm should be able to fully relax and move the mouse with little effort. If typing causes you pain, you'll need to adjust how you type.
