Recommended Monitor Type

I recommend LED back-lit LCDs for monitor types.
They are free of mercury and lead. They are slim and power efficient. They have good coloring and are easier on the eyes than florescent or CRTs.
OLEDs are also an upcoming type of monitors to look into, however they may have more of a limited lifespan.
Should I through out my old monitor (CRT or florescent)?
No. If you want to get rid of it you need to recycle it.
Pros of replacing it – save power, less heat, more room, better for eyes
Pros of keeping it – save money on buying a new one and hauling old one out, less waste