Im gonna agree with shirayuki~chan, but ill also add Yuni from katekyo hitman reborn!, her costume will run to the max of ur budget but you prob wont need a wig! Its an extremely cute cosplay too!
Adelheid (KHR!)- 85% done
Fem!Austrian War Succesion France (Hetalia/Nyotalia)- 10% done
Fem!Izaya (Drrr!)- 90% done
Magent!Teto (Vocaloid)- 95% done