Since I use my ghd for all my styling, I only have a crappy cheap one for drying off my hair and blasting it for some volume. It might sound a bit daft, but you might be better off asking your hairdresser as they can tell you whether or not its worth splashing out on an ionic one or not.
The Parlux range of hair dryers have always been known to be the the very creme de la creme of hairdryers. And they just came out a new one, the Parlux 3500 which has that ceramic and ionic system, with a powerful 2000 watts of power - all packed into a travel sized hair dryer. Oh and it also comes in pink! ( as well as red, black, dark green)
Err...I know so much, because I finally bought one, after much researching and reviewing. and threatening finger wagging from my hairdresser when he heard that I didnt own a hair dryer. heh.
Oh, and I can direct you to a reputable online site that sells the hairdryers a tad cheaper than you would get from normal hair salons, if that helps.
i agree with little scribble, i absolutely love my parlux hairdryer, if you are in the UK you can get them from http://www.saloneasy.com/hairdryers.htm you wont regret it, theyre hot!