I have a Salton digital scale with a flat plate. IMO the most important features to look for are digital that goes from ozs to kgs, and in at least 1/4oz increments. The absolute MUST HAVE feature for me though is the tare function. That means I can use whatever bowl, plate, dish, cup or pan I want to and I know that I'm measuring correctly.
Where I live we are really limited to what we can find at Bed Bath & Beyond, and our local store really only has 4 or 5 models to choose from. I couldn't find any appreciable difference between the $30 scale and the $40 scale so I bought the $30 one; they had one for $70 or $80 too but I don't use it all that much so I opted for the lesser.
I am very glad that I do have one, though! 
if you go to the link below, Rose Levy Bearanbaum (cake bible book). Go down about a 1/4 of the way. She gives the tips on what scale will be good.
http://www.realbakingwithrose.com/2006/02/
I bought this one recommended by Rose and I love it. The link below was the cheapest I found
http://www.saveonscales.com/product_7001dx_kitchen_food_scales.html
I have a Pelouze postage scale I got at the office supply. It goes up to 5 pounds. The two most important features for me are the ability to switch to grams and the tare feature. Next time I'll get one that takes more weight so I can put my 6 quart KA bowl on it and measure right into that.
Powdered sugar really should be weighed rather than measured becasue one cup could weigh anywhere from 5 oz to 10 oz depending on how airy it is. It can really mess with your recipe. The same is true for flour. I got my scale a few years ago to make bread and still use it for frostings. I agree the tare feature is great. I put a bowl on the scale, tare it, and plop in the shortening till I have 16oz for my frosting rather than trying to jam it into a measuring cup. Works great!
which one did you get. The one I got from myweigh suggested (that I bought save on scales), was small and light does not take up much room. Mushbug9, I agree I love the tara feature on mine. Really handy for powder sugar, flour, etc.
I got a scale because some of my recipes where in grams, oz, etc.
Mine's a Salter flat digital and I agree that the kg and tare functions are must haves. I originally bought it for a diet, but I use it for all kinds of stuff now. For example, lots of recipes call for 1 pound of hamburger--but my store doesn't package hamburger in standard 1 pound packages. So I buy 1 pound plus, use what I need, freeze the rest and eventually combine all the extras to make another pound. And now I use it to weigh sugar and marshmallows and cake flour and whatever else I need to bake and frost cakes. It's a great tool.
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