I would suggest to consider Hotforex and FXCM (if they weren't mentioned there before). They both works good for scalping as well as have decent size so I don't worry about safety, trading with large deposits as such companies focused on long-term relationship..
Don't be lured by nice spreads and instant execution, reliability is most important you need to seek for.
Don't be lured by nice spreads and instant execution, reliability is most important you need to seek for.