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I did a lot of research on this but haven't changed mine from stock yet. I think that an upgraded solid rubber mount, rather than poly, is the best choice for anything but a dedicated track car. Gets you most of the way there in terms of stiffness without the excessive noise and vibration that polyurethane mounts transmit. Rubber also handles heat better and won't ever make noise.
The Bimmerworld performance engine mounts seem like a popular choice and cost about the same as new stock mounts. They're modeled off the 'Group N' mounts BMW used to sell (for a ridiculous $800).
ECS tuning just came out with a similar product with their 75A solid rubber engine mounts. These are cheaper than the bimmerworld ones but there are no reviews of them so I don't know of the quality or how they compare in stiffness.
I'm going to get one of these soon for my car.
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