I've come to believe that a blow dryer is a blow dryer. Depending on what you're actually using it for is what matters. Like if you have a hard time blowing your own hair because the dryer's too heavy, then you'd go for a lightweight blow dryer. You'd need the concentrator attachment if you plan on blowing your hair out, and a diffuser if you have curly hair.
a stylist at my salon uses a Gold N Hot, which is like a $20 dryer. It gets really hot, and works great. She got another one, which is a pink Cricket blow dryer, and its very lightweight. Also, the on/off button is in a position so that you don't turn it on/off by accident (know what I mean?)
I use the blow dryer that came in my cosmetology kit from school. works fine...I think its a scalpmaster.