You might want to consider Pepperstone or Tickmill. I've used both for scalping with good success. I say "Tickmill", but it was actually Armada until the 1st of this year. Since the switchover, their servers seem even more reliable, generating excellent trading opportunities. I have an ECN account with Tickmill, so I pay commission on top of the very narrow spreads. The total spread, including commission, on EURUSD is typically around 0.7 pips. Low enough to making scalping feasible.