I personally like cosplaymagic. They're the people who I got my Ichigo Kurosaki cosplay from, and its my favorite of my cosplays along with one of the best looking. Another friend of mine got his favorite from them too, a Sajin Komamura cosplay. I'll admit that some of their stuff is average and some is just ugh, but a lot of their stuff is pretty good too. You just gotta wade through their costumes to find stuff that you like, just like with any other store.
On a side note, they can be expensive. However, they do make up for it by having great shipping times and will bump up the type of shipping depending on how much you spend. My costume literally took a week to get to me, which is awesome considering it shipped from across the planet xD