Make sure you understand the controls on the range. Washers and dryers come in a variety of sizes, but the most popular is Super Capacity, which cuts down on the amount of loads you have to do. Gas is usually a more cost-effective way to power a dryer, but usually is limited to homes that have gas available to them. Signals and buzzers can either be helpful or bothersome. If your laundry is in the basement, consider a signal to know when your cycles are finished.
Front loaders save a great deal of water, energy and detergent compared to top loaders.
However, top loaders are more popular and less expensive. Depending on the type of laundry you do, your needs may be different. Look for a dishwasher that is insulated for sound. There are many different levels, and they are usually reflected in the price of the unit. The hard food disposal is a great feature that is built into the pump area.