You did ask : "GDM previous broker had $7 per lot brokerage is that acceptable ? Asking bcos don't what is minimum brokerage in forex ? reply welcomed."
No, $7 is way too much. One Lot should be no more than $4, better less.
Look at this broker : Tickmill, they have $4
My broker is Atom8 (a small broker) and is even bettar than Tickmill.
In general the bigger your account the less commission you pay.