If Scalping is your priority, I would definitely suggest opting for IC Markets' True Ecn account, they offer some of the lowest spreads compared to most other brokers out there. You could check the spread chart here myfxbook[dot]com/forex-broker-spreads( Sorry couldn't post links). Also there are a number of reliable IBs out there for IC Markets offering a discounted commission of 5.5$ per round lot which is a really good deal.
In addition to these, the fact that they are regulated by ASIC is a advantage. Personally, I've also found their service staff to be extremely helpful in multiple occasions.