Clothes washers are basically all the same. Think about it. It is a open tub that holds water and a motor that moves your clothes around. You can put all the bells and whistles you want (a grilled sandwhich maker as said above), but the washer is still a tub with a motor attached. The biggest difference on cleaning is the detergent you use, not the washer.
There are minor variations, of course. Ultimately, these minor variations may be meaningful enough to warrant spending more. I personally like a washer with several choices on load size. That way I don't waste water, energy, or detergent by filling it full for a small load. And a washer that does a good job spinning out the water is quite desireable to me (so you save a bundle on dryer time and dryer energy usage). You won't find those features on the very low end washer models. I tend to lean towards a few models above the very low end.
Front loading washers are quite nice (more room, far better spin drying, use less water and electricity, etc). But, they require very expensive detergent (to function properly with less water), the door seals can leak, and the tight door seals mean that many models are plagued by mold (mold was an issue that was fixed permanently in top loaders years ago, but really old top loaders still have mold issues).
As for dryers, there is even less of a difference with each model. I'd lean closer to the low end here. Splurge on a few more features on the washer instead. A dryness sensor helps, but that is just about the only really useful add-on feature.