Like Slinky said, if all you want is dry hair then any hairdryer will do that for you. The more expensive hairdryers tend to come with more extras such as a thin nozzle for when you are blow drying your hair straight and a diffuser for when you want to dry it curly. They will also have more settings, mine has 3 heat settings and also a cool setting which you are supposed to use when you've dried your hair to 'set' the style.
The cool setting also comes in handy for drying your nail polish, I have found.
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Old aunts used to come up to me at weddings, poking me in the ribs, cackling and telling me
'You'll be next.' They stopped when I started doing the same to them at funerals.
