To get good quality slo-mo you need a camera which shoots a high number of frames per second. This will obviously necessitate a fast shutter speed.
However a fast shutter speed at 25fps (or 30fps) will result in less blurred individual images. There will still be only 25 or 30 frames per second to be "slowed down"
This may well result in better footage than that shot at a slower shutter speed when slowed down in software are the software is interpolating less blurred shots.
I use Sony Vegas and there are two methods of slowing down (velocity envelopes and stretching clips) which if combined can slow down 12 times. If I need more (I never have as yet) I simply render out then re-import the rendered file and slow that down.

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Tim