and most hairdressers would faint if you told them you bought a wet to dry straightener
DO NOT GET A WET/DRY STRAIGHTENER!!!!!! Yes, we would faint. They are horrible things the amount of people who have come into salons I have worked at with damage from using it on wet hair is shocking.
You are better off getting a decent straightener, the cheapest being Wahl which you can get for around $40-$50 on sale at price attack (the slimline ones) or if you want to spend the money a GHD is the best.
Use it on dry hair only, and get a heat protectant product, RPR make a good spray for around $20 and Keratase (a lorel brand) have one thats around $40.

Although it will take you an extra 10-15mins to do your hair you wont cause much/if any damage to it.