Hi,
As far as the energy efficient part goes, the Energy Start web page has some material:
http://www.energystar.gov/index.cfm?...up&pgw_code=RF
They offer lists of all the fridges out there along with yearly energy use.
The yellow tags in the fridges also give the yearly power consumption.
I would go more by the actual KWH usage rather than whether the frige gets the Energy Star rating, as (I believe) they divide fridges into size classes and award the label within each size class -- this seems dumb to me.
There was some serious talk about a program like the "cash for clunkers" program for cars, but for appliances -- you might check on that before you buy. Here is one article on it:
http://www.usatoday.com/tech/news/20...tes23_ST_N.htm
One of the blurbs form the Energy Star site:
What else should I look for when buying a refrigerator?
Ask for an ENERGY STAR model.
When buying a refrigerator, request an ENERGY STAR qualified model to ensure it is energy efficient.
Check the yellow EnergyGuide label.
Use this label to determine the model's energy use, compare the energy use of similar models, and estimate annual operating costs.
Learn How to Use the EnergyGuide Label 
.
Consider buying a refrigerator with a top-mounted freezer.
Models with top-mounted freezers use 10–25% less energy than bottom-mount or side-by-side models.
Purchase an appropriately sized refrigerator.
Generally, the larger the refrigerator, the greater the energy consumption. The most energy-efficient models are typically 16–20 cubic feet.
Consider skipping the ice-maker and dispenser.
Automatic ice-makers and through-the-door dispensers increase energy use by 14–20%. They also raise the purchase price by $75–250.
Related Information:
Refrigerator Usage Best Practices
Gary