SELECT "conference" FROM table_203_187 WHERE "win %" > (SELECT "win %" FROM table_203_187 WHERE "conference" = 'atlantic coast conference')
which conference has a win percentage that is above the atlantic coast conference ?
CREATE TABLE table_203_187 (
    id number,
    "conference" text,
    "bids" number,
    "record" text,
    "win %" number,
    "quarterfinals" number,
    "semifinals" number,
    "final" number,
    "champions" number
)