NO HOT PINK SHUICHI, PLEASE? His hair is not rabid psycho raver pink, it is much more subdued than that. A hot pink wig is better reserved for a Stephanie from Lazy Town cosplay.
If you really want to do it, then go for it, but I'd be much more pumped if I saw a Shuichi with a less... bold statement for his hair. If you're working on another cosplay, go for the one you view as the cheapest and fastest to do.
My token Gravitation cosplay is Reiji from the manga. Since Murakami-sama has no continuity at all, I picked and chose between her outfits and pulled one out (it's in my profile). I met her at Otakon this year and she fangirled over my costume. The translator told me that she never saw anyone do Reiji before, loved how I portrayed her, and said that my Bazooka and Name-tag were the perfect touch. Her manager almost groped me reaching for it! XD