Get a front loader washer and dryer.
I don't necessarily agree with this statement. There are a lot of factors to consider.
What is important to you? Price? The look? Operational Noise? Cost of ownership over the lifetime of the unit? Types of features? Being earth friendly?
If your sole purpose for buying the new machine is to be earth friendly, then sure go for it, buy front loading machines and don't turn back, but...
The big negative is price. The front loading washers are vastly more expensive than top loading. And most of the time that price difference is rarely recouped by the owner. It is becoming more affordable and with that more reasonable to buy the front loading machines, but still not a given. Additional knocks on front loaded washers: must use more expensive detergent(unless you are already doing so), more expensive to repair if they break, harder to get clothes in and out of because they are lower to the ground (they do sell pedestals but that adds ~$200 more to the equation), they take longer to wash your clothes, and depending on the model many complain about how clean some models actually get their clothes compared to a top loading machine (of course you can increase the cleaning by using more water or more cycles but then you start to neglect the benefit of the energy efficiency because you use more water and more electricity than a normal cycle).
There are of course benefits...they are much quieter, most can handle bigger loads, easier on your clothes because there is no agitator, the spin cycle removes more water (more on this later) and most people think they look nicer.
Another factor is how many loads do you do? Are you single and run only 1-2 loads per week or do you have a family of 5 and do a load every day. Obviously the more you use your washer the faster you will recoup the extra money spent on the front loading machine.
Dryers on the other hand are a much easier decision. I say do NOT buy the fancy matching energy efficient to the front loading washer (all dryers are front loading to my knowledge) unless you just want a matching pair of machines and willing to part with that extra cost.
There are a few features (buzzer when finished, wrinkle free option, auto sensing, different temperature settings, etc) so those should be easy for you to compare across models and should be available not matter what type of dryer you get. The big thing that determines the cost effectiveness of a dryer is how wet the clothes are when you put them in to dry. the front loading washer does the extra work for you getting your clothes 2-3 times dryer than a top loading washer. That alone saves a lot of money in operational cost of the dryer.
To me price is a big factor, I can think of a lot of things I would rather spend an extra 500-1000 on, but laundry room is rather close to my theater so noise was also a big factor and I'm single so I don't do a lot of loads.
My current washer and dryer I bought from frys for $400 TOTAL 7 years ago and they have never broken down on me. However, I live in Austin and recently Texas had a tax free weekend on buying an energy star appliance, home depot was running a sale, I got it price matched based a price from another store, I had a 10% off coupon, used my discover card which gives me 5% cash back at home improvement stores for that month, Austin water and gas gives a $150 rebate for installing an energy efficient washer, and I ended up selling my old washer for $50, so in the end it cost me ~$200 to get a new washer (they even delivered and installed the puppy). So that was totally worth it to me (it will still take me ~2 years to make my money back)
After using it for a month, I can tell you my dryer runs half as long to dry as it did before.
I got the LG WM2050CW after researching it. It initially got bad reviews, but LG updated the software to have better cycles and since that update consumer reports gave it a best buy rating. Its reasonably priced compared to other front loaders and it has done a good job in cleaning my clothes.
So first you need to decide what is important to you and once you find a few models you are interested in I would suggest you google them for reviews from reputable sites (like consumer reports). IMHO a front loading washer (dryer) is not necessarily a given. However, if you do decide to go that route, then be sure to do some research to see if your utility companies (water, electricity, and GAS if applicable) offer any type of incentives for purchasing energy star appliances. Also the fed gave money to every state for energy saving programs (I believe most if not all involve appliances). Each state decided how/when to use the money so you might also benefit from that program as well. See this site for more details:
http://www.energysavers.gov/financial/70020.html