Have you tried to delay (Not a plugin echo/delay btw) one side of the audio stream by 10-30m? You know the old acoustic guitar trick you hear on everthing. Can make for massive width....try it.

Hope this helps.

Cheers.

I would recommed the same as getinthere. Basic and very good means for widening the sound. For percussion and hihats you must be very carefull, somewhere between 5 and 10 ms. For pads and other stuff 10-40ms depending on the sound type. After that the sound starts to act as delay.