Speaking from experience - Hellocosplay is horrible and you should avoid them at all costs. They steal their pictures, their costume quality is abysmal, and their customer service is just sad.
Don't waste your money.
Finished: Armin Arlert, Mayoi Hachikuji, Tomoko Kuroki, Ultimate Madoka, fem!Masky
In progress: Kougyoku Ren, Lightning Farron
Upcoming cons: Sabakon, Youmacon, Con+Alt+Delete