LED-backlit LCD monitors are more energy efficient, thinner and lighter, and produce better white and black levels compared to CCFL-Backlit LCD monitors.
So if your trying to choose between a LED-Backlit and a CCFL-Backlit monitor I would recommend an LED-Backlit LCD monitor.
Also, yes its okay to get a widescreen monitor. I personally prefer widescreen monitors. I suggest 16:10 ratio if you can afford it.
What games do you play?