I do not scalp but use Trader's Way, FXCM and of late, Aplari. If you are looking for low spreads, accurate quotes, it may be a good idea to look out for ECN brokers.
But do note, not all brokers allow scalping so you may want to sort through the brokers by checking for this. And there're only a few retail ECN brokers, who offer competitive account packages, so your list should get whittled down a bit, let us know what happens..