Commission charges for the following Currenex broker

I have decided to switch to Currenex for my FX platform.

Does anybody know how much are the commission charges for the following broker :

1. MF Global
2. CMS
3. Divisa Capital
4. Marex ?

Any recommendations ?
Low com + tightest spread + best liquidity = my total cost considered.
Low com + big spreads + no liquidity = FORGET IT....