A suggestion, based on my own experience; I trade off Marketscope charts (in as much as I place orders through them with dbfx/fxcm), but have pro real time purring happily in the background for part of my swing/position FX decision making. I love certain features with the PRT package, particularly the alerts linked to my wav files, when conditions are met for me to make a decision/take an action they chime, I jump to action, Pavlov's dog decision making?
I'm therefore taking decisions based on other charts to my brokers', but using theirs to take the trades. There's no compulsion for using your brokers' charts, often it's simply personal preference. For example, I havn't really got to grips with fxcm's strategy trader package and despite their otherwise excellence Dukascopy's package is a joke. Marketscope and PRT are enough for me, just adapt.