No simulator is going to be exactly like your heli without some tweaking. Even two Trex 600's can fly very different from each other depending on the setups. Sims can get close but they're never quite the same as the real thing.

Real Flight (I think that's what you meant, not Top Flight) has several models that will be close enough to get you used to hovering, orientation and many maneuvers. You can also download models created by others.

Phoenix includes more of the current popular models, including the Trex 600 so you might want to look into that one. I haven't tried it but I think it's supposed to be pretty good as well.