Going to second investing in a quality wig. If you don't like Epic Cosplay, take a look at Arda Wigs. Try taking a look at Moemall and Fantasy Sheep too, I've heard good things about them.
Finished: Armin Arlert, Mayoi Hachikuji, Tomoko Kuroki, Ultimate Madoka, fem!Masky
In progress: Kougyoku Ren, Lightning Farron
Upcoming cons: Sabakon, Youmacon, Con+Alt+Delete