What do you want the sim to do?
If it's get the basics of learning to fly a helicopter, I'd recommend the Flyit device. It is based on FS2002, but the cockpit and visuals are really pretty good, and for the price, provides superb training.
It has no motion, but it has been selling quite well and is getting very close to European approval as an FNPT.
Otherwise, a true sim would be more expensive than the real thing. We've just been working on getting a data package for a sim manufacturer for another helicopter and just that package is worth over $250,000 - before they cut metal for the box. Motion is going to add significantly to the cost for a system that meets the 'simulator' requirements. And so on.
In my view, the visual system is the most important thing, and followed in order by math modeling that is close enough, and finally, way down the list is motion.