I'm looking at those too. I need to replace mine soon--and I'm considering a high-end tourmaline dryer. I've done a lot of research, and I think I'm going to go for the FHI Heat Nano Salon Pro 2000 Hair Dryer, based on its reviews. (Google it, they also sell it on Amazon).
I probably won't buy it until January...but when I do, I'll post back my own review on this forum.
I did notice that my ionic hair dryer I have now made a dramatic difference in my frizz level, so I'm thinking why not splurge on the cutting-edge technology? My hair needs all the help it can get.